Armed RCMP officers approach Parliament Hilll following a shooting incident in Ottawa on Wednesday.

Armed RCMP officers approach Centre Block on Parliament Hilll following a shooting incident in Ottawa on Wednesday.

Armed RCMP officers guard the front of Langevin Block on Parliament Hilll following a shooting incident in Ottawa on Wednesday.

An Ottawa police officer and police dog run up Metcalfe Street following shootings in downtown Ottawa on Wednesday.

Ottawa police try to clear people from an area on Metcalfe Street following shootings in downtown Ottawa on Wednesday.

SergeSergeant-at-Arms Kevin Vickers is pictured in the Senate chamber on Parliament Hill in Ottawa in June 2011. According to Veterans Affairs Minister Julian Fantino, Vickers shot dead one of the suspects in Wednesday's shooting incident on Parliament Hill.

Police officers take cover near Parliament Hilll following a shooting incident in Ottawa on Wednesday.

Paramedics and police pull a victim away from the Canadian War Memorial in Ottawa on Wednesday. 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. The Associated Press / The Canadian Press, Adrian Wyld)

A Royal Canadian Mounted Police intervention team walks past a gate on Parliament hill in Ottawa on Wednesday. A soldier standing guard at the National War Memorial was shot by an unknown gunman and there were reports of gunfire inside the halls of Parliament.

A Royal Canadian Mounted Police team responds to a reported shooting in the Parliament building in Ottawa Wednesday. The Associated Press / The Canadian Press, Adrian Wyld

A heavily armed Royal Canadian Mounted Police officer takes position at the gate of 24 Sussex Drive, the official residence of the prime minister, on Wednesday. The Associated Press / The Canadian Press, Justin Tang