Canada's prime minister has insisted his country will not be intimidated, after a gunman rampaged through parliament before being shot dead, reports GHN based on BBC.
Stephen Harper described the attacker as a terrorist and promised to "redouble" anti-terror efforts.
The gunman, reportedly a Muslim convert named Michael Zehaf-Bibeau, shot and killed a soldier at an Ottawa war memorial before entering parliament.
On Monday, a Muslim convert killed a soldier in Quebec.
Mr Harper described that earlier attack as a plot inspired by the Islamic State (IS) militant group.
Earlier this month, Canada announced plans to join the US-led campaign of air strikes against Islamic State (IS) militants in Iraq.
However, there is no official confirmation that any of this week's attacks are directly linked to IS or the new military campaign.