The federal leaders commemorated on this Sunday the ninth anniversary of the attack on the Parliament building that resulted in the death of a Canadian reservist.

They also remembered the death of another member of the armed forces in a separate attack two days before the incident in Ottawa.

"On this day nine years ago, a terrorist attack on the national war memorial and on the Parliament building in Ottawa resulted in one death and several injuries, inflicting a deep wound on our country, on all Canadians, and on the values we cherish," said Prime Minister Justin Trudeau in a statement.

Corporal Nathan Cirillo, 24, a member of the Argyll and Sutherland Highlanders, was killed in 2014 while guarding the Tomb of the Unknown Soldier in Ottawa, where the gunman subsequently entered the central building of the Parliament with a rifle before being stopped by House of Commons Sergeant-at-Arms Kevin Vickers and other officers.

Officer Curtis Barrett, who was cited in the Ontario Provincial Police investigation for his role in stopping the gunman, later received the Star of Courage, which "recognizes acts of conspicuous courage in hazardous circumstances."

Trudeau's statement also noted that Master Corporal Patrice Vincent, 53, who was killed two days earlier in Saint-Jean-sur-Richelieu, Quebec, after being struck by a man in a vehicle along with another member of the armed forces. The police later shot and killed the driver.

Trudeau said: "We remember them as brave members of the Canadian Armed Forces who dedicated themselves to their country, and we extend our heartfelt condolences to their families, loved ones, and colleagues."

In a separate statement, Conservative leader Pierre Poilievre said: "Today, we remember these men who were killed while serving their duty, and we honor their memory."

He added: "Furthermore, as we reflect on the twisted motivations of the perpetrators, we renew our commitment to uphold the very principles they sought to destroy, namely the values of freedom and democracy."

He also said: "Canadians will never allow such acts of hatred to undermine our country. We will continue to fight terrorism here at home and around the world so that all people can live in peace, security, and freedom."

NDP leader Jagmeet Singh said in a statement that "his thoughts are with the loved ones of Corporal Nathan Cirillo and Officer Patrice Vincent."