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Boston's Logan Airport and some of the city's local hotels continue to remain open following the Boston Marathon bombing. The two explosions that took place Monday afternoon have killed three people and injured 176 more, but the Massachusetts Office of Travel & Tourism says the city is still open, save for one area.
Local police have sectioned off the area around Copley Square, since the area is now considered a crime scene. The area will be "closed off for the foreseeable future," The Boston Police Department told the Telegraph. Nearby, local hotels such as the Fairmont Copley Plaza remain open but, as the Guardian reports, the hotel is only allowing registered guests and staff into the hotel.
Increased security measures are now also in place at hotels and Logan Airport, equalling long lines and delays for guests and travellers. The explosions have also resulted in a trickle-down effect, causing other cities like Los Angeles, New York to beef up security in their hotels and airports, notes the Daily Mail.
Porter Airlines has issued a travel advisory to passengers looking to fly to Boston on Tuesday, warning "longer check-in and security lines at Boston Logan Airport may be experienced." The carrier also advised passengers to call ahead to check the status of their flights.
Air Canada has also issued a travel alert for all flights to and from Boston, citing that "airport facilities constraints" could impact flights. The airline tweeted Tuesday morning that they would be removing fees to change flights for those planning to head to Boston.
As of Tuesday, Canada's federal government hasn't issued any travel advisories against the United States, but has updated their page with information on the explosions.
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Boston Deals With Aftermath Of Marathon
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Neighbors come to pay their respects at the Richard house in the Dorchester neighborhood of Boston, Tuesday, April 16, 2013. Martin Richard, 8, was killed in Monday's bombings at the finish line of the Boston Marathon. (AP Photo/Michael Dwyer) (credit:AP)
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Tammy Lynch, right, comforts her daughter Kaytlyn, 8, after leaving flowers and some balloons at the Richard house in the Dorchester neighborhood of Boston, Tuesday, April 16, 2013. Kaytlyn was paying her respects to her friend, 8-year old Martin Richard who was killed in Monday's bombings at the finish line of the Boston Marathon. (AP Photo/Michael Dwyer) (credit:AP)
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President Barack Obama speaks in the Brady Press Briefing Room of the White House in Washington, Tuesday, April 16, 2013, following the explosions at the Boston Marathon. (AP Photo/Charles Dharapak) (credit:AP)
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Jodie Brown of England carries her luggage past a guarded checkpoint near the finish line of the Boston Marathon on her way to catch a plane in Boston Tuesday, April 16, 2013. (AP Photo/Winslow Townson) (credit:AP)
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First time Boston Marathon runner Amber Lazo of Miami pulls her luggage past a guarded checkpoint near the finish line of the Boston Marathon on her way to catch a flight in Boston Tuesday, April 16, 2013. Her sister, Jocelyn Siedle pushes thirteen-month-old Nina Lazo in a baby stroller behind her. (AP Photo/Winslow Townson) (credit:AP)
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Responders search the area around the Boston Public Library near the finish line of the Boston Marathon with a ladder truck in Boston Tuesday, April 16, 2013. Two bombs blew up seconds apart Monday at the finish line of one of the world's most storied races, tearing off limbs and leaving the streets spattered with blood and strewn with broken glass. At least three people were killed, including an 8-year-old boy, and more than 170 were wounded. (AP Photo/Winslow Townson) (credit:AP)
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Jodie Brown of England carries her luggage past a guarded checkpoint near the finish line of the Boston Marathon on her way to catch a plane in Boston Tuesday, April 16, 2013. Two bombs blew up seconds apart Monday at the finish line of one of the world's most storied races, tearing off limbs and leaving the streets spattered with blood and strewn with broken glass. Three people were killed, including an 8-year-old boy, and more than 170 were wounded. (AP Photo/Winslow Townson) (credit:AP)
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An Amtrak Police officer and his sniffer dog monitor travelers at the 30th Street Station Tuesday, April 16, 2013, in Philadelphia. The deadly explosions at the Boston Marathon on Monday reverberated on both sides of the Atlantic as cities from Los Angeles to London saw an increase in security. (AP Photo/Matt Rourke) (credit:AP)
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The flag flies at half staff in front of the Neighborhood House Charter School in the Dorchester neighborhood of Boston, Tuesday, April 16, 2013. Boston Marathon bombing victim, 8-year old Martin Richard attended the school. (AP Photo/Michael Dwyer) (credit:AP)
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President Barack Obama finishes speaking in the Brady Press Briefing Room of the White House in Washington, Tuesday, April 16, 2013, about the Boston Marathon explosions.(AP Photo/Susan Walsh) (credit:AP)
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Nicholas Yanni, 32, of Boston, speaks to reporters at Tufts Medical Center in Boston, Tuesday, April 16, 2013. Yanni, and his wife, Lee Ann Yanni, 31, not pictured, were among the 14 patients injured in the bombing at the finish of the Boston Marathon who were treated at Tufts. (AP Photo/Josh Reynolds) (credit:AP)
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A U.S. Capitol police officer monitors the area as an American flag flies at half-staff on Capitol Hill in Washington, Tuesday, April 16, 2013, after Monday's Boston Marathon explosions. (AP Photo/Jose Luis Magana) (credit:AP)
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Nicholas Yanni, 32, of Boston, speaks to reporters at Tufts Medical Center in Boston, Tuesday, April 16, 2013. Yanni, and his wife, Lee Ann Yanni, 31, were among the 14 patients injured in the bombing at the finish of the Boston Marathon who were treated at Tufts. (AP Photo/Josh Reynolds) (credit:AP)
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Security personnel stand in front of a PATH train station at the World Trade Center site in New York, Tuesday, April 16, 2013. Police armed with rifles and extra patrol cars were stationed around the city Tuesday as New York remained in a heightened state of alert until more is known about the Monday bombings at the Boston Marathon. (AP Photo/Seth Wenig) (credit:AP)
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Los Angeles International Airport Police Officer, Daniel Keehne works security with partner Axa Tuesday April 16, 2013 at the airport in Los Angeles. Security measures have been increased in light of Monday's bombings at the Boston Marathon. (AP Photo/Nick Ut) (credit:AP)
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"Pray for Martin" is written in chalk at a park near the home of Martin Richard in the Dorchester neighborhood of Boston,Tuesday, April 16, 2013. 8-year old Martin was killed in the bombing at the finish line of the Boston Marathon on Monday. (AP Photo/Michael Dwyer) (credit:AP)
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Bureau of Alcohol, Tobacco and Firearms, (ATF) agents and Boston police detectives gather near the finish line of the Boston Marathon in Boston, Tuesday, April 16, 2013. The bombs that ripped through the crowd at the Boston Marathon, killing at least three people and wounding more than 170, were fashioned out of pressure cookers and packed with shards of metal, nails and ball bearings to inflict maximum carnage, a person briefed on the investigation said Tuesday. (AP Photo/Winslow Townson) (credit:AP)
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FBI agents gather near the finish line of the Boston Marathon in Boston Tuesday, April 16, 2013. The bombs that ripped through the crowd at the Boston Marathon, killing at least three people and wounding more than 170, were fashioned out of pressure cookers and packed with shards of metal, nails and ball bearings to inflict maximum carnage, a person briefed on the investigation said Tuesday. (AP Photo/Winslow Townson) (credit:AP)
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Bureau of Alcohol, Tobacco and Firearms, (ATF) agents and Boston police detectives gather near the finish line of the Boston Marathon in Boston, Tuesday, April 16, 2013. The bombs that ripped through the crowd at the Boston Marathon, killing at least three people and wounding more than 170, were fashioned out of pressure cookers and packed with shards of metal, nails and ball bearings to inflict maximum carnage, a person briefed on the investigation said Tuesday. (AP Photo/Winslow Townson) (credit:AP)
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Two men in haz-mat suits investigate the scene of the first bombing on Boylston Street in Boston Tuesday, April 16, 2013 near the finish line of the 2013 Boston Marathon, a day after two blasts nearby killed three and injured over 170 people. (AP Photo/Elise Amendola) (credit:AP)
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Investigators in haz-mat suits examine the scene of the second bombing on Boylston Street in Boston Tuesday, April 16, 2013 near the finish line of the 2013 Boston Marathon, a day after two blasts killed three and injured over 170 people. (AP Photo/Elise Amendola) (credit:AP)
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Investigators in haz-mat suits examine the scene of the second bombing on Boylston Street in Boston Tuesday, April 16, 2013 near the finish line of the 2013 Boston Marathon, a day after two blasts killed at least three and injured over 170 people. (AP Photo/Elise Amendola) (credit:AP)
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Flowers sit at a police barrier near the finish line of the Boston Marathon in Boston Tuesday, April 16, 2013. Explosions at the finish of the Marathon Monday Killed at least 3 people and injured over 170. (AP Photo/Winslow Townson) (credit:AP)
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New York Assembly members James Skoufis, D-Woodbury, left, Patricia Fahy, D-Albany, center, and Luis Sepulveda, D-Bronx, join other legislators in a moment of silence for victims of the explosions at Monday's Boston Marathon, in the Assembly Chamber at the Capitol in Albany, N.Y., on Tuesday, April 16, 2013. (AP Photo/Mike Groll) (credit:AP)
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A jetliner flies over flags flying at half-staff at the Washington Monument in Washington, Tuesday, April 16, 2013, after President Obama ordered flags to be lowered on federal building to honor the loss of life from the explosions at the Boston Marathon. (AP Photo/J. David Ake) (credit:AP)
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A bystander takes a photo from a window as Seattle Police Dept. robots are used to remove an item from a suspicious backpack in downtown Seattle, Tuesday, April 16, 2013. The backpack was found to be harmless, but in light of Monday's explosions at the Boston Marathon, authorities in Seattle and other cities increased security patrols and heightened the level of alertness for any possible threat to public safety. (AP Photo/Ted S. Warren) (credit:AP)
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Boston marathon runner Ed Coco, left, stands with his wife Jill Coco, both of Atlanta, after the couple arrived at Hartsfield-Jackson airport from Boston, Tuesday, April 16, 2013, in Atlanta. "The venue was just the most beautiful venue I've ever been at." said Ed Coco. "It's bittersweet. It's sad that it had to end that way. We're happy to be home. It's very nerve wrecking." The deadly explosions near the finish line at the Boston Marathon on Monday killed nearly three and injured more than 140 people. (AP Photo/David Goldman) (credit:AP)
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Two men in haz-mat suits investigate the scene near the first bombing on Boylston Street in Boston Tuesday, April 16, 2013 near the finish line of the 2013 Boston Marathon, a day after two blasts nearby killed at least three and injured over 170 people. (AP Photo/Elise Amendola) (credit:AP)
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Seattle Police Dept. vehicles block off a street in while remote controlled vehicles are used to examine a suspicious backpack in downtown Seattle, Tuesday, April 16, 2013. The backpack was found to be harmless, but in light of Monday's explosions at the Boston Marathon, authorities in Seattle and other cities increased security patrols and heightened the level of alertness for any possible threat to public safety. (AP Photo/Ted S. Warren) (credit:AP)
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A Seattle Police officer looks on as Seattle Police Dept. robots are used to open a suspicious backpack in downtown Seattle, Tuesday, April 16, 2013. The backpack was found to be harmless, but in light of Monday's explosions at the Boston Marathon, authorities in Seattle and other cities increased security patrols and heightened the level of alertness for any possible threat to public safety. (AP Photo/Ted S. Warren) (credit:AP)
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Birds fly away as a Seattle Police Dept. robotic vehicle is driven back to its truck after it was used to examine a suspicious backpack in downtown Seattle, Tuesday, April 16, 2013. The backpack was found to be harmless, but in light of Monday's explosions at the Boston Marathon, authorities in Seattle and other cities increased security patrols and heightened the level of alertness for any possible threat to public safety. (AP Photo/Ted S. Warren) (credit:AP)
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An official carries away a backpack that contained a hair dryer and other items after Seattle Police Dept. robots at left were used used to check out the suspicious backpack in downtown Seattle, Tuesday, April 16, 2013. The backpack was found to be harmless, but in light of Monday's explosions at the Boston Marathon, authorities in Seattle and other cities increased security patrols and heightened the level of alertness for any possible threat to public safety. (AP Photo/Ted S. Warren) (credit:AP)
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Neighbors hug outside the home of the Richard family in the Dorchester neighborhood of Boston, Tuesday, April 16, 2013. Martin Richard, 8, was killed in Mondays bombing at the finish line of the Boston Marathon. (AP Photo/Michael Dwyer) (credit:AP)
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Peace is written on the sidewalk in front of the Richard house in the Dorchester neighborhood of Boston, Tuesday, April 16, 2013. Martin Richard, 8, was killed in Monday's bombing at the finish line of the Boston Marathon. (AP Photo/Michael Dwyer) (credit:AP)
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Two women place flowers on the doorstep of the Richard house in the Dorchester neighborhood of Boston, Tuesday, April 16, 2013. Martin Richard, 8, was killed in the Mondays bombings at the finish line of the Boston Marathon. The boys mother, Denise, and 6-year-old sister, Jane, were badly injured. (AP Photo/Michael Dwyer) (credit:AP)
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Boston police officers near a Humvee April 16, 2013 in Boston, Massachusetts, in the aftermath of two explosions that struck near the finish line of the Boston Marathon April 15. A massive probe was underway Tuesday after two bombs struck the Boston Marathon, killing at least three and wounding more than 100. Monday's blasts near the finishing line raised fears of a terrorist attack more than a decade after nearly 3,000 people were killed in suicide airliner strikes on New York, Washington and Pennsylvania on September 11, 2001. US President Barack Obama went on national television to warn against 'jumping to conclusions' but a senior White House official, speaking on condition of anonymity, said such an attack was 'clearly an act of terror.' AFP PHOTO Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images) (credit:Getty Images)
Boston Deals With Aftermath Of Marathon Explosions(37 of82)
BOSTON - APRIL 16: Police officers stand near the Boston Marathon finish line from Clarendon and Boylston Street on April 16, 2013 in Boston, Massachusetts. Security is especially tight in the city of Boston after two explosions went off near the finish of the Marathon, killing three people and injuring at least 141 others. (Photo by Darren McCollester/Getty Images) (credit:Getty Images)
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BOSTON - APRIL 16: A sign on a door makes notice of being closed at Trident Booksellers Cafe on Newbury Street shows closed on April 16, 2013 in Boston, Massachusetts. Security is especially tight in the city of Boston after two explosions went off near the finish of the Marathon, killing three people and injuring at least 141 others. (Photo by Darren McCollester/Getty Images) (credit:Getty Images)
Boston Deals With Aftermath Of Marathon Explosions(39 of82)
BOSTON, MA - APRIL 16: Claire Schaeffer Dufy walks with a sign she made to support her runner husband, Scott, near the scene of a twin bombing at the Boston Marathon on April 16, 2013 in Boston, Massachusetts. The twin bombings, which occurred near the marathon finish line, resulted in the deaths of three people while hospitalizing at least 128. The bombings at the 116-year-old Boston race, resulted in heightened security across the nation with cancellations of many professional sporting events as authorities search for a motive to the violence. (Photo by Spencer Platt/Getty Images) (credit:Getty Images)
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Workers find bags containing runners' personal effects as they return them to their owner near the finish line of the Boston Marathon, after explosions killed three and injured more than 140 in Boston, Tuesday, April 16, 2013. The bombs that blew up seconds apart at the finish line of one of the world's most storied races left the streets spattered with blood and glass, and gaping questions of who chose to attack at the Boston Marathon and why. (AP Photo/Charles Krupa) (credit:AP)
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BOSTON, MA - APRIL 16: People congregate at a security gate near the scene of a twin bombing at the Boston Marathon on April 16, 2013 in Boston, Massachusetts. The twin bombings, which occurred near the marathon finish line, resulted in the deaths of three people while hospitalizing at least 128. The bombings at the 116-year-old Boston race, resulted in heightened security across the nation with cancellations of many professional sporting events as authorities search for a motive to the violence. (Photo by Spencer Platt/Getty Images) (credit:Getty Images)
Boston Deals With Aftermath Of Marathon Explosions(42 of82)
BOSTON, MA - APRIL 16: A Boston police officer stands guard near the scene of a twin bombing at the Boston Marathon on April 16, 2013 in Boston, Massachusetts. The twin bombings, which occurred near the marathon finish line, resulted in the deaths of three people while hospitalizing at least 128. The bombings at the 116-year-old Boston race, resulted in heightened security across the nation with cancellations of many professional sporting events as authorities search for a motive to the violence. (Photo by Spencer Platt/Getty Images) (credit:Getty Images)
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BOSTON, MA - APRIL 16: A napkin and broken salt and pepper shakers are seen after customers fled an outdoor restaurant near the scene of a twin bombing at the Boston Marathon on April 16, 2013 in Boston, Massachusetts. The twin bombings, which occurred near the marathon finish line, resulted in the deaths of three people while hospitalizing at least 128. The bombings at the 116-year-old Boston race, resulted in heightened security across the nation with cancellations of many professional sporting events as authorities search for a motive to the violence. (Photo by Spencer Platt/Getty Images) (credit:Getty Images)
Boston Deals With Aftermath Of Marathon Explosions(44 of82)
BOSTON, MA - APRIL 16: The unfinished meals of fleeing customers are left on tables at an outdoor restaurant near the scene of a twin bombing at the Boston Marathon on April 16, 2013 in Boston, Massachusetts. The twin bombings, which occurred near the marathon finish line, resulted in the deaths of three people while hospitalizing at least 128. The bombings at the 116-year-old Boston race, resulted in heightened security across the nation with cancellations of many professional sporting events as authorities search for a motive to the violence. (Photo by Spencer Platt/Getty Images) (credit:Getty Images)
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BOSTON, MA - APRIL 16: A heavily armed Boston police officer stands blocks away from the scene of a twin bombing at the Boston Marathon on April 16, 2013 in Boston, Massachusetts. The twin bombings, which occurred near the marathon finish line, resulted in the deaths of three people while hospitalizing at least 128. The bombings at the 116-year-old Boston race, resulted in heightened security across the nation with cancellations of many professional sporting events as authorities search for a motive to the violence. (Photo by Spencer Platt/Getty Images) (credit:Getty Images)
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BOSTON, MA - APRIL 16: Unused thermal blankets for marathon participants are piled near the scene of a twin bombing at the Boston Marathon on April 16, 2013 in Boston, Massachusetts. The twin bombings, which occurred near the marathon finish line, resulted in the deaths of three people while hospitalizing at least 128. The bombings at the 116-year-old Boston race, resulted in heightened security across the nation with cancellations of many professional sporting events as authorities search for a motive to the violence. (Photo by Spencer Platt/Getty Images) (credit:Getty Images)
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BOSTON, MA - APRIL 16: A Boston police officer stands near the scene of a twin bombing at the Boston Marathon on April 16, 2013 in Boston, Massachusetts. The twin bombings, which occurred near the marathon finish line, resulted in the deaths of three people while hospitalizing at least 128. The bombings at the 116-year-old Boston race, resulted in heightened security across the nation with cancellations of many professional sporting events as authorities search for a motive to the violence. (Photo by Spencer Platt/Getty Images) (credit:Getty Images)
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BOSTON, MA - APRIL 16: A runner stands at a security gate near the scene of a twin bombing at the Boston Marathon on April 16, 2013 in Boston, Massachusetts. The twin bombings, which occurred near the marathon finish line, resulted in the deaths of three people while hospitalizing at least 128. The bombings at the 116-year-old Boston race, resulted in heightened security across the nation with cancellations of many professional sporting events as authorities search for a motive to the violence. (Photo by Spencer Platt/Getty Images) (credit:Getty Images)
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BOSTON, MA - APRIL 16: A Boston police officer stands near the scene of a twin bombing at the Boston Marathon on April 16, 2013 in Boston, Massachusetts. The twin bombings, which occurred near the marathon finish line, resulted in the deaths of three people while hospitalizing at least 128. The bombings at the 116-year-old Boston race, resulted in heightened security across the nation with cancellations of many professional sporting events as authorities search for a motive to the violence. (Photo by Spencer Platt/Getty Images) (credit:Getty Images)
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BOSTON, MA - APRIL 16: National Guard soldiers walk near the scene of a twin bombing at the Boston Marathon on April 16, 2013 in Boston, Massachusetts. The twin bombings, which occurred near the marathon finish line, resulted in the deaths of three people while hospitalizing at least 128. The bombings at the 116-year-old Boston race, resulted in heightened security across the nation with cancellations of many professional sporting events as authorities search for a motive to the violence. (Photo by Spencer Platt/Getty Images) (credit:Getty Images)
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BOSTON, MA - APRIL 16: A discarded runners bib is viewed near the scene of a twin bombing at the Boston Marathon on April 16, 2013 in Boston, Massachusetts. The twin bombings, which occurred near the marathon finish line, resulted in the deaths of three people while hospitalizing at least 128. The bombings at the 116-year-old Boston race, resulted in heightened security across the nation with cancellations of many professional sporting events as authorities search for a motive to the violence. (Photo by Spencer Platt/Getty Images) (credit:Getty Images)
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BOSTON, MA - APRIL 16: Pedestrians walk by National Guard soldiers guarding a roadblock near the scene of a twin bombing at the Boston Marathon on April 16, 2013 in Boston, Massachusetts. The twin bombings, which occurred near the marathon finish line, resulted in the deaths of three people while hospitalizing at least 128. The bombings at the 116-year-old Boston race, resulted in heightened security across the nation with cancellations of many professional sporting events as authorities search for a motive to the violence. (Photo by Spencer Platt/Getty Images) (credit:Getty Images)
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BOSTON, MA - APRIL 16: Closed streets are viewed blocks away from the scene of a twin bombing at the Boston Marathon on April 16, 2013 in Boston, Massachusetts. The twin bombings, which occurred near the marathon finish line, resulted in the deaths of three people while hospitalizing at least 128. The bombings at the 116-year-old Boston race, resulted in heightened security across the nation with cancellations of many professional sporting events as authorities search for a motive to the violence. (Photo by Spencer Platt/Getty Images) (credit:Getty Images)
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BOSTON, MA - APRIL 16: A man jogs down a street near the scene of a twin bombing at the Boston Marathon on April 16, 2013 in Boston, Massachusetts. The twin bombings, which occurred near the marathon finish line, resulted in the deaths of three people while hospitalizing at least 128. The bombings at the 116-year-old Boston race, resulted in heightened security across the nation with cancellations of many professional sporting events as authorities search for a motive to the violence. (Photo by Spencer Platt/Getty Images) (credit:Getty Images)
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BOSTON, MA - APRIL 16: People congregate at a security gate near the scene of a twin bombing at the Boston Marathon on April 16, 2013 in Boston, Massachusetts. The twin bombings, which occurred near the marathon finish line, resulted in the deaths of three people while hospitalizing at least 128. The bombings at the 116-year-old Boston race, resulted in heightened security across the nation with cancellations of many professional sporting events as authorities search for a motive to the violence. (Photo by Spencer Platt/Getty Images) (credit:Getty Images)
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BOSTON, MA - APRIL 16: The unfinished meals of fleeing customers are left on tables at an outdoor restaurant near the scene of a twin bombing at the Boston Marathon on April 16, 2013 in Boston, Massachusetts. The twin bombings, which occurred near the marathon finish line, resulted in the deaths of three people while hospitalizing at least 128. The bombings at the 116-year-old Boston race, resulted in heightened security across the nation with cancellations of many professional sporting events as authorities search for a motive to the violence. (Photo by Spencer Platt/Getty Images) (credit:Getty Images)
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BOSTON, MA - APRIL 16: National Guard soldiers guard a roadblock near the scene of a twin bombing at the Boston Marathon on April 16, 2013 in Boston, Massachusetts. The twin bombings, which occurred near the marathon finish line, resulted in the deaths of three people while hospitalizing at least 128. The bombings at the 116-year-old Boston race, resulted in heightened security across the nation with cancellations of many professional sporting events as authorities search for a motive to the violence. (Photo by Spencer Platt/Getty Images) (credit:Getty Images)
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Karen Kaye, right, communications and community relations director for Big Peach Running Co., embraces Reginald Bohannon, of Atlanta, before the start of an organized moment of silence and memorial run to show solidarity with victims of the Boston Marathon bombing, Tuesday, April 16, 2013, in Atlanta. The explosions Monday afternoon killed at least three people and injured more than 140. (AP Photo/David Goldman) (credit:AP)
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Runners job along Peachtree Street as part of an organized moment of silence and memorial run to show solidarity with victims of the Boston Marathon bombing, Tuesday, April 16, 2013, in Atlanta. The explosions Monday afternoon killed at least three people and injured more than 140. (AP Photo/David Goldman) (credit:AP)
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Runners job along Peachtree Street as part of an organized moment of silence and memorial run to show solidarity with victims of the Boston Marathon bombing, Tuesday, April 16, 2013, in Atlanta. The explosions Monday afternoon killed at least three people and injured at least 100 others. (AP Photo/David Goldman) (credit:AP)
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John Tackett, of Atlanta, left, weeps during an organized moment of silence and memorial run to show solidarity with victims of the Boston Marathon bombing, Tuesday, April 16, 2013, in Atlanta. The explosions Monday afternoon killed at least three people and injured at least 100 others. (AP Photo/David Goldman) (credit:AP)
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French army soldiers patrol near a Eurostar train at the Gare du Nord station, in Paris, Tuesday, April 16, 2013. In the wake of the Boston attacks, the French Interior Ministry has ordered local authorities across France to immediately reinforce security measures already in place since the January intervention in Mali began. The ministry did not change the threat level. (AP Photo/Remy de la Mauviniere) (credit:AP)
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Runners job along Peachtree Street as part of an organized moment of silence and memorial run to show solidarity with victims of the Boston Marathon bombing, Tuesday, April 16, 2013, in Atlanta. The explosions Monday afternoon killed at least three people and injured at least 100 others. (AP Photo/David Goldman) (credit:AP)
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Reginald Bohannon, of Atlanta, holds a United States flag as he stands outside the Big Peach Running Co. after taking part in an organized moment of silence and memorial run to show solidarity with victims of the Boston Marathon bombing, Tuesday, April 16, 2013, in Atlanta. The explosions Monday afternoon killed at least three people and injured at least 100 others. (AP Photo/David Goldman) (credit:AP)
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Two women leave after placing flowers on the doorstep of the Richard house in the Dorchester neighborhood of Boston, Tuesday, April 16, 2013. Martin Richard, 8, was killed in the Mondays bombings at the finish line of the Boston Marathon. The boys mother, Denise, and 6-year-old sister, Jane, were badly injured. (AP Photo/Michael Dwyer) (credit:AP)
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Runners observe a moment of silence before the start of an organized memorial run to show solidarity with victims of the Boston Marathon bombing, Tuesday, April 16, 2013, in Atlanta. The explosions Monday afternoon killed at least three people and injured at least 100 others. (AP Photo/David Goldman) (credit:AP)
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Reginald Bohannon, of Atlanta, runs along Peachtree Street in an organized moment of silence and memorial run to show solidarity with victims of the Boston Marathon bombings, Tuesday, April 16, 2013, in Atlanta. The explosions Monday afternoon killed at least three people and injured at least 100 others. (AP Photo/David Goldman) (credit:AP)
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BOSTON - APRIL 16: People walk along Clarendon Street and Boylston Street on April 16, 2013 in Boston, Massachusetts. Security is especially tight in the city of Boston after two explosions went off near the finish of the Marathon, killing three people and injuring at least 141 others. (Photo by Darren McCollester/Getty Images) (credit:Getty Images)
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A crumpled runners' blanket on a sidewalk April 16, 2013 in Boston, Massachusetts, in the aftermath of two explosions that struck near the finish line of the Boston Marathon April 15. A massive probe was underway Tuesday after two bombs struck the Boston Marathon, killing at least three and wounding more than 100. Monday's blasts near the finishing line raised fears of a terrorist attack more than a decade after nearly 3,000 people were killed in suicide airliner strikes on New York, Washington and Pennsylvania on September 11, 2001. US President Barack Obama went on national television to warn against 'jumping to conclusions' but a senior White House official, speaking on condition of anonymity, said such an attack was 'clearly an act of terror.' AFP PHOTO Stan HONDAAFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images) (credit:Getty Images)
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People look at the scene on Boylston Street April 16, 2013 in Boston, Massachusetts, in the aftermath of two explosions that struck near the finish line of the Boston Marathon April 15. A massive probe was underway Tuesday after two bombs struck the Boston Marathon, killing at least three and wounding more than 100. Monday's blasts near the finishing line raised fears of a terrorist attack more than a decade after nearly 3,000 people were killed in suicide airliner strikes on New York, Washington and Pennsylvania on September 11, 2001. US President Barack Obama went on national television to warn against 'jumping to conclusions' but a senior White House official, speaking on condition of anonymity, said such an attack was 'clearly an act of terror.' AFP PHOTO Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images) (credit:Getty Images)
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Charlie Johnston stands on Newbury Street and looks toward the finish line area a block away from Boylston Street April 16, 2013 in Boston, Massachusetts, in the aftermath of two explosions that struck near the finish line of the Boston Marathon April 15. Johnston ran in the marathon and finished before the explosions. A massive probe was underway Tuesday after two bombs struck the Boston Marathon, killing at least three and wounding more than 100. Monday's blasts near the finishing line raised fears of a terrorist attack more than a decade after nearly 3,000 people were killed in suicide airliner strikes on New York, Washington and Pennsylvania on September 11, 2001. US President Barack Obama went on national television to warn against 'jumping to conclusions' but a senior White House official, speaking on condition of anonymity, said such an attack was 'clearly an act of terror.' AFP PHOTO Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images) (credit:Getty Images)
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A Boston police officer stands on a closed-off Boylston Street April 16, 2013 in Boston, Massachusetts, in the aftermath of two explosions that struck near the finish line of the Boston Marathon April 15.A massive probe was underway Tuesday after two bombs struck the Boston Marathon, killing at least three and wounding more than 100. Monday's blasts near the finishing line raised fears of a terrorist attack more than a decade after nearly 3,000 people were killed in suicide airliner strikes on New York, Washington and Pennsylvania on September 11, 2001. US President Barack Obama went on national television to warn against 'jumping to conclusions' but a senior White House official, speaking on condition of anonymity, said such an attack was 'clearly an act of terror.' AFP PHOTO Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images) (credit:Getty Images)
US-ATTACKS-BOSTON(73 of82)
The Arlington Street Church stands on a corner where Boylston Street is closed off April 16, 2013 in Boston, Massachusetts, in the aftermath of two explosions that struck near the finish line of the Boston Marathon April 15. A massive probe was underway Tuesday after two bombs struck the Boston Marathon, killing at least three and wounding more than 100. Monday's blasts near the finishing line raised fears of a terrorist attack more than a decade after nearly 3,000 people were killed in suicide airliner strikes on New York, Washington and Pennsylvania on September 11, 2001. US President Barack Obama went on national television to warn against 'jumping to conclusions' but a senior White House official, speaking on condition of anonymity, said such an attack was 'clearly an act of terror.' AFP PHOTO Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images) (credit:Getty Images)
US-ATTACKS-BOSTON(74 of82)
A man who ran in the Boston Marathon looks down a closed-off Boylston Street April 16, 2013 in Boston, Massachusetts, in the aftermath of two explosions that struck near the finish line of the Boston Marathon April 15. A massive probe was underway Tuesday after two bombs struck the Boston Marathon, killing at least three and wounding more than 100. Monday's blasts near the finishing line raised fears of a terrorist attack more than a decade after nearly 3,000 people were killed in suicide airliner strikes on New York, Washington and Pennsylvania on September 11, 2001. US President Barack Obama went on national television to warn against 'jumping to conclusions' but a senior White House official, speaking on condition of anonymity, said such an attack was 'clearly an act of terror.' AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images) (credit:Getty Images)
US-ATTACKS-BOSTON(75 of82)
A heavily armed Boston police officer stands guard in front of the Taj Hotel April 16, 2013 in Boston, Massachusetts, in the aftermath of two explosions that struck near the finish line of the Boston Marathon April 15. A massive probe was underway Tuesday after two bombs struck the Boston Marathon, killing at least three and wounding more than 100. Monday's blasts near the finishing line raised fears of a terrorist attack more than a decade after nearly 3,000 people were killed in suicide airliner strikes on New York, Washington and Pennsylvania on September 11, 2001. US President Barack Obama went on national television to warn against 'jumping to conclusions' but a senior White House official, speaking on condition of anonymity, said such an attack was 'clearly an act of terror.' AFP PHOTO Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images) (credit:Getty Images)
US-ATTACKS-BOSTON(76 of82)
Heavily armed Boston police officers stands guard in front of the Taj Hotel April 16, 2013 in Boston, Massachusetts, in the aftermath of two explosions that struck near the finish line of the Boston Marathon April 15. A massive probe was underway Tuesday after two bombs struck the Boston Marathon, killing at least three and wounding more than 100. Monday's blasts near the finishing line raised fears of a terrorist attack more than a decade after nearly 3,000 people were killed in suicide airliner strikes on New York, Washington and Pennsylvania on September 11, 2001. US President Barack Obama went on national television to warn against 'jumping to conclusions' but a senior White House official, speaking on condition of anonymity, said such an attack was 'clearly an act of terror.' AFP PHOTO Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images) (credit:Getty Images)
Boston Deals With Aftermath Of Marathon Explosions(77 of82)
BOSTON, MA - APRIL 16: Swat team members and special police units assemble in the Boston Common on April 16, 2013 in Boston, Massachusetts. Security is especially tight in the city of Boston after two explosions went off near the finish of the Marathon, killing three people and injuring at least 141 others. (Photo by Darren McCollester/Getty Images) (credit:Getty Images)
Boston Deals With Aftermath Of Marathon Explosions(78 of82)
BOSTON, MA - APRIL 16: Police units assemble along the Boston Public Garden on April 16, 2013 in Boston, Massachusetts. Security is especially tight in the city of Boston after two explosions went off near the finish of the Marathon, killing three people and injuring at least 141 others. (Photo by Darren McCollester/Getty Images) (credit:Getty Images)
Boston Deals With Aftermath Of Marathon Explosions(79 of82)
BOSTON - APRIL 16: Swat team members and special police units assemble in the Boston Common on April 16, 2013 in Boston, Massachusetts. Security is especially tight in the city of Boston after two explosions went off near the finish of the Marathon, killing three people and injuring at least 141 others. (Photo by Darren McCollester/Getty Images) (credit:Getty Images)
Boston Deals With Aftermath Of Marathon Explosions(80 of82)
BOSTON, MA - APRIL 16: The marathon finish line bridge is seen on Boylston Street on April 16, 2013 in Boston, Massachusetts. on April 16, 2013 in Boston, Massachusetts. Security is especially tight in the city of Boston after two explosions went off near the finish of the Marathon, killing three people and injuring at least 141 others. (Photo by Darren McCollester/Getty Images) (credit:Getty Images)
Boston Deals With Aftermath Of Marathon Explosions(81 of82)
BOSTON, MA - APRIL 16: Unclaimed finish line bags are viewed near the scene of a twin bombing at the Boston Marathon, on April 16, 2013 in Boston, Massachusetts. Three people are confirmed dead and at least 141 injured after the explosions went off near the finish line of the marathon yesterday. The bombings at the 116-year-old Boston race, resulted in heightened security across the nation with cancellations of many professional sporting events as authorities search for a motive to the violence. (Photo by Spencer Platt/Getty Images) (credit:Getty Images)
Boston Deals With Aftermath Of Marathon Explosions(82 of82)
BOSTON, MA - APRIL 16: Unclaimed finish line bags are left near the scene of a twin bombing at the Boston Marathon, on April 16, 2013 in Boston, Massachusetts. Three people are confirmed dead and at least 141 injured after the explosions went off near the finish line of the marathon yesterday. The bombings at the 116-year-old Boston race, resulted in heightened security across the nation with cancellations of many professional sporting events as authorities search for a motive to the violence. (Photo by Spencer Platt/Getty Images) (credit:Getty Images)