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What we know so far:
- Two shootings took place in Ottawa on Wednesday. One at the National War Memorial and another in Parliament's Centre Block.
- Cpl. Nathan Cirillo, guarding the memorial, was shot and killed.
- The suspected shooter, Michael Zehaf-Bibeau, was killed in Parliament.
- Sergeant-at-Arms Kevin Vickers hailed as a hero for shooting gunman
- PM Stephen Harper responds to incidents, saying 'Canada will never be intimidated'
- Police say Thursday that only one suspect was responsible for the attacks.
- Eyewitnesses recall the fear and confusion from Wednesday's events
- World leaders express sympathy, support.