A look back on the anniversary of the attacks.
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Years after the Sept. 11 attacks, these images still resonate, reminding us of the absolute physical and emotional devastation that so many experienced that day.

WARNING: The below images contain graphic content.

Credit: Associated Press
United Airlines Flight 175 closes in on World Trade Center Tower 2 just before impact.
Credit: AP Photo/Chao Soi Cheong

Smoke pours off World Trade Center Tower 1 and flames explode from Tower 2 as it is struck by American Airlines Flight 175.

Credit: Spencer Platt via Getty Images

A fiery blast rocks the south tower of the World Trade Center as the hijacked United Airlines Flight 175 from Boston crashes into the building.

Credit: AP Photo/Richard Drew/File

A person falls from the north tower.

Credit: Associated Press

Pedestrians flee the area as the south tower collapses.

Credit: Associated Press

People stand on a dirt mound at the Vince Lombardi Service Area on the New Jersey Turnpike as they watch smoke billowing from the remains of the World Trade Center.

Credit: AP Photo/Amy Sancetta

People hang out of broken windows of the north tower.

Credit: Associated Press

The south tower of the World Trade Center collapses.

Credit: Stan Honda via Getty Images
Marcy Borders is covered in dust as she takes refuge in an office building. Borders died in 2015 after a battle with cancer.
Credit: AP Photo/Gulnara Samoilova

Survivors make their way through smoke, dust and debris on Fulton Street, about a block from the collapsed towers.

Credit: Alex Fuchs via Getty Images

The rubble of the World Trade Center smolders.

Credit: AP Photo/Mark Lennihan

A tennis shoe and debris, photographed one block from the World Trade Center.

Credit: Gamma-Keystone via Getty Images

Photographs show missing friends and relatives in New York on Sept. 20, 2011

Credit: Mario Tama via Getty Images

A firefighter breaks down after the World Trade Center buildings collapsed.

Credit: NY Daily News via Getty Images

A firefighter is covered with ash after the attacks.

Credit: Getty Images

Smoke and flames can be seen at the Pentagon shortly after a hijacked jetliner was crashed into the building in Washington, D.C.

Credit: Dough Kanter via Getty Images

An American flag flies in the foreground as one of the World Trade Center towers burns in the background.

Credit: David Maxwell via Getty Images

Mounted police make their way along an access road leading to the crash site of United Airlines Flight 93 through the early morning fog on Sept. 12, 2001, in Shanksville, Pennsylvania. The plane was hijacked and crashed, killing all 45 people on board.

Credit: NY Daily News via Getty Images

Firefighter Kevin Shea of Ladder 35 lies semi-conscious in a debris field with firefighter Ritchie Nogan of 113 standing over him. Shea was the only survivor of his unit. He was carried out by Nogan, two EMS workers and photographer Todd Maisel.

Correction: An earlier version of this story incorrectly stated the flight name of the plane that crashed into the second World Trade Center tower. It was United Airlines Flight 175.

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