Saturday night's attack on a police officer in Edmonton is being treated as a terrorist attack. A lone driver hit the officer with his car, then got out and stabbed him. The officer is recovering in hospital.
The man has been arrested. Soon we'll have more news about his motive, but I suspect we already know.
As the little girl said in 'Poltergeist': "They're here."
The key is to remain calm, stay vigilant, be ready for anything.
Lone wolf attacks are the most difficult to anticipate, police said.