OTTAWA -- A man was detained by police this morning not far from Stephen Harper as the prime minister stopped by the National War Memorial to pay tribute to Cpl. Nathan Cirillo.
UPDATE: The man has been identified as 39-year-old Robert Hennigar. He has been charged with one count of obstructing police and is expected to appear in court Friday, according to a statement by the RCMP.
Harper was visiting the memorial to lay a wreath where Cirillo was fatally shot Wednesday by a gunman who then raced to Parliament Hill, where he was killed in a gunfight in the halls of the Centre Block.
As he arrived, however, police could be seen wrestling a man to the ground and cuffing him before taking him to a nearby cruiser.
"It's just somebody that tried to breach the crime scene, and that's all we have for now,'' said Ottawa police Const. Marc Soucy.
Several federal MPs were also on hand to pay their respects at the memorial, even taking part in an impromptu rendition of O Canada.
Harper and the rest of the MPs are expected to be in the House of Commons to resume the business of government.
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In Photos: Ottawa Shooting
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An Ottawa police officer runs with his weapon drawn outside Parliament Hill in Ottawa on Oct. 22, 2014. (credit:AP Photo/The Canadian Press, Sean Kilpatrick)
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An Ottawa police officer runs with his weapon drawn, outside Parliament Hill in Ottawa, on Oct. 22, 2014. (credit:AP Photo/The Canadian Press, Sean Kilpatrick)
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RCMP intervention team members clear the area at the entrance of Parliament Hill in Ottawa, Oct. 22, 2014. (credit:AP Photo/The Canadian Press, Adrian Wyld)
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Police and paramedics tend to a soldier shot at the National Memorial near Parliament Hill in Ottawa on Oct. 22, 2014. (credit:AP Photo/The Canadian Press, Adrian Wyld)
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Police teams enter Centre Block at Parliament Hill in Ottawa on Oct. 22, 2014. (credit:AP Photo/The Canadian Press, Justin Tang)
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Ottawa police patrol along the Elgin St. steps near the National War Memorial in Ottawa, Canada, Oct. 22, 2014. (credit:Mike Carroccetto/Getty Images)
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RCMP and Ottawa police cruisers on Wellington St. stand guard after a shooting at the National War Memorial near the Canadian Parliament Oct. 22, 2014. (credit:Mike Carroccetto/Getty Images)
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Ottawa police direct traffic on Elgin St. near the National War Memorial, Oct. 22, 2014. (credit:Mike Carroccetto/Getty Images)
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An Ottawa police officer stands guard on Wellington St. after a shooting occurred at the National War Memorial near the Canadian Parliament Oct. 22, 2014. (credit:Mike Carroccetto/Getty Images)
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An Ottawa police office draws her weapon outside Parliament Hill in Ottawa on Oct. 22, 2014. (credit:AP Photo/The Canadian Press, Sean Kilpatrick)
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Police teams move towards Centre Block at Parliament Hill in Ottawa on Oct. 22, 2014. (credit:AP Photo/The Canadian Press, Justin Tang)
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An Ottawa police officer runs with his weapon drawn outside Parliament Hill in Ottawa on Oct. 22, 2014. (credit:AP Photo/The Canadian Press, Sean Kilpatrick)
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Police secure an area around Parliament Hill in Ottawa on Oct. 22, 2014. (credit:AP Photo/The Canadian Press, Adrian Wyld)
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A soldier standing guard at the National War Memorial was shot by an unknown gunman and people reported hearing gunfire inside the halls of Parliament. (credit:AP Photo/The Canadian Press, Jacques Boissinot)
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Paramedics and police pull a shooting victim away from the Canadian War Memorial in Ottawa on Wednesday Oct.22, 2014. A Canadian soldier standing guard at the National War Memorial in Ottawa has been shot by an unknown gunman and there are reports of gunfire inside the halls of Parliament. (credit:THE CANADIAN PRESS/Adrian Wyld)
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An RCMP intervention team runs next to a Parliament building in Ottawa Wednesday Oct.22, 2014. A Canadian soldier standing guard at the National War Memorial in Ottawa has been shot by an unknown gunman and there are reports of gunfire inside the halls of Parliament. (credit:THE CANADIAN PRESS/Adrian Wyld)
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RCMP intervention team members walk past a gate on Parliament hill in Ottawa. (credit:THE CANADIAN PRESS/Adrian Wyld)
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A soldier, police and paramedics tend to a soldier shot at the National Memorial near Parliament Hill in Ottawa on Wednesday Oct.22, 2014. (credit:THE CANADIAN PRESS/Adrian Wyld)
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Police secure an area around Parliament Hill in Ottawa on Wednesday Oct.22, 2014. A gunman opened fire at the National War Memorial, wounding a soldier, then moved to nearby Parliament Hill and wounded a security guard before he was shot, reportedly by Parliament's sergeant-at-arms. (credit:THE CANADIAN PRESS/Adrian Wyld)
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Police secure an area around Parliament Hill in Ottawa on Wednesday Oct.22, 2014. A gunman opened fire at the National War Memorial, wounding a soldier, then moved to nearby Parliament Hill and wounded a security guard before he was shot, reportedly by Parliament's sergeant-at-arms. (credit:THE CANADIAN PRESS/Adrian Wyld)
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Police and paramedics tend to a soldier shot at the National Memorial near Parliament Hill in Ottawa on Wednesday Oct.22, 2014. Police are expanding a perimeter around Parliament Hill after a gunman opened fire at the National War Memorial, wounding a soldier, then moved to nearby Parliament Hill where he was reportedly shot by Parliament's sergeant-at-arms after wounding a security guard. (credit:THE CANADIAN PRESS/Adrian Wyld)
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Heavily-armed RCMP officers arrive at 24 Sussex Drive, the residence of Canada's Prime Minister Stephen Harper on Wednesday, Oct. 22, 2014. (credit:THE CANADIAN PRESS/Justin Tang)
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Civilians leave a secured area around Parliament Hill in Ottawa on Wednesday Oct.22, 2014. Police are expanding a perimeter around Parliament Hill after a gunman opened fire at the National War Memorial, wounding a soldier, then moved to nearby Parliament Hill where he was reportedly shot by Parliament's sergeant-at-arms after wounding a security guard.The Hill remains under lockdown amid reports there may be two to three shooters, according to a senior official locked in the Official Opposition Leaders' office. (credit:THE CANADIAN PRESS/Adrian Wyld)
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Police teams move towards Centre Block at Parliament Hill in Ottawa on on Wednesday, Oct. 22, 2014. A gunman opened fire at the National War Memorial, wounding a soldier, then moved to nearby Parliament Hill and wounded a security guard before he was shot, reportedly by Parliament's sergeant-at-arms. (credit:THE CANADIAN PRESS/Justin Tang)
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An Ottawa police office draws her weapon in Ottawa on Wednesday Oct.22, 2014. Police are expanding a security perimeter in the heart of the national capital after a gunman opened fire and wounded a soldier at the National War Memorial before injuring a security guard on Parliament Hill, where he was reportedly shot dead by Parliament's sergeant-at-arms. (credit:THE CANADIAN PRESS/Sean Kilpatrick)
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An Ottawa police officer runs with his weapon drawn in Ottawa on Wednesday Oct.22, 2014.Police are expanding a security perimeter in the heart of the national capital after a gunman opened fire and wounded a soldier at the National War Memorial before injuring a security guard on Parliament Hill, where he was reportedly shot dead by Parliament's sergeant-at-arms. (credit:THE CANADIAN PRESS/Sean Kilpatrick)
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People under lockdown look out of an office building near Parliament Hill in Ottawa on Wednesday, Oct. 22, 2014. A gunman opened fire at the National War Memorial, wounding a soldier, then moved to nearby Parliament Hill and wounded a security guard before he was shot, reportedly by Parliament's sergeant-at-arms. (credit:THE CANADIAN PRESS/Justin Tang)
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Police search cars and pedestrians as they leave the Alexandra Bridge and enter Gatineau, Que. near the Parliament Buildings during an active shooter situation in Ottawa on Wednesday, October 22, 2014. (credit:THE CANADIAN PRESS/ Patrick Doyle)
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Police officers take cover in Ottawa on Wednesday Oct.22, 2014.Police are expanding a security perimeter in the heart of the national capital after a gunman opened fire and wounded a soldier at the National War Memorial before injuring a security guard on Parliament Hill, where he was reportedly shot dead by Parliament's sergeant-at-arms. (credit:THE CANADIAN PRESS/Sean Kilpatrick)
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Traiffic is stopped below Parliament Hill during a lock down in the downtown core of Ottawa after a member of the Canadian Armed Forces was shot in Ottawa, Wednesday October 22, 2014. (credit:THE CANADIAN PRESS/Fred Chartrand)
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'Terror Strikes Canada in the Heart': De Morgen, Belgium(39 of63)
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'Canada Startled by Attack': Volkskrant, Netherlands(40 of63)
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'Shooting Puts World on Edge': AD, Netherlands(41 of63)
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'Canada's Capital Becomes a War Zone': Aftenposten, Norway(42 of63)
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'Shots In Canadian Parliament': Frankfurter Allegemeine Zeitung, Germany(43 of63)
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The National, United Arab Emirates(44 of63)
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Prime minister's limo and protection detail at 24 Sussex Drive. (credit:Tony Fouhse)
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East Block of Parliament. (credit:Tony Fouhse)
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Bank of Canada building. (credit:Tony Fouhse)
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National Capital Commission display titled "Representations of Canada" in Confederation Square. (credit:Tony Fouhse)
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Roadblock on Elgin Street. (credit:Tony Fouhse)
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Bus shelter on Parliament Hill. (credit:Tony Fouhse)
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Prime Minister's Office, Langevin Block. (credit:Tony Fouhse)
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Israeli Embassy. (credit:Tony Fouhse)
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Government buildings on Laurier Avenue. (credit:Tony Fouhse)
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Embassy of the Unites States of America. (credit:Tony Fouhse)
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Photojournalists on Wellington Street. (credit:Tony Fouhse)
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Taxation Centre at 875 Heron Road. (credit:Tony Fouhse)
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Confederation Boulevard. (credit:Tony Fouhse)
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Public Service Alliance of Canada headquarters. (credit:Tony Fouhse)
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RCMP Headquarters. (credit:Tony Fouhse)