Three years after Parliament Hill attacks, terror threat persists

Sunday marks the three-year anniversary of the horrific terrorist attack on Parliament Hill in Ottawa.

On Oct. 22, 2014, Cpl. Nathan Cirillo was standing ceremonially on guard at the National War Memorial near Parliament Hill when he was shot in the back by a terrorist.

The 24-year-old Canadian soldier and father of a young son died of his injuries, and the terrorist continued his deadly raid.