" Security tight in Canada as police probe Parliament gunman's ties"

Canada's capital faced a third day of heightened security on Friday as police searched for any clues that the man who shot and killed a soldier and charged into the parliament building had help in plotting his attack.

Groups of Ottawa residents gathered early around the national war memorial where the soldier, Cpl. Nathan Cirillo, 24, was slain on Wednesday at the start of a brazen daylight attack by a man police identified as Michael Zehaf-Bibeau, a 32-year-old Canadian citizen.