It's been 11 years since the terrorist attack at the National War Memorial and on Parliament Hill

It has been 11 years since the terrorist attack at the National War Memorial and on Parliament Hill in Ottawa.

The attacker, Michael Zehaf-Bibeau, approached Corporal Nathan Cirillo, who was posted at the Tomb of the Unknown Soldier and shot him at close range twice in the back, fatally wounding him.

From there, Zehaf-Bibeau entered the Centre Block of the Parliament Buildings, running along the Hall of Honour corridor toward the Library of Parliament.

Pursued by RCMP officers, he passed, on his left, the door to a committee room in which former Prime Minister Stephen Harper and the governing Conservative Members of Parliament were meeting. Directly opposite was the door to another caucus room, where the leader of the opposition, Thomas Mulcair, and New Democratic Party MPs were gathered.

The RCMP placed Prime Minister Harper in a closet while Conservative MPs made a barricade at the doors.

Finally, the attacker reached an alcove by the entrance to the Library of Parliament and hid out of sight of RCMP officers. The Sergeant-at-Arms of the House of Commons, Kevin Vickers, retrieved his 9mm Smith & Wesson 5946 handgun from a lock-box and entered the hall.

Vickers's security team, which had been chasing, yelled to Vickers that the suspect was hiding in the alcove. Vickers immediately ran behind the other side of a nearby column, then dove past the column and fired upward at the attacker.

RCMP Constable Curtis Barrett fired the shot that killed the attacker after they had fired in his direction.

In a statement, Prime Minister Mark Carney said, “Today, Canadians remember the brutal and horrific terrorist attack at the National War Memorial and on Parliament Hill. Eleven years ago to this day, the attacker claimed the life of Corporal Nathan Cirillo, who was standing guard at the Tomb of the Unknown Soldier, and left several others injured.

On this solemn anniversary, we remember Corporal Cirillo and Warrant Officer Patrice Vincent, who was killed two days earlier in a separate attack in Saint-Jean-sur-Richelieu, Québec."