EDMONTON, Alberta — A car and knife attack on a police officer outside a football game and the ramming of pedestrians by a moving van that left four people injured appear to be the work of a single suspected terrorist, authorities said Sunday.
Police Chief Rod Knecht said officers took the suspect, later described as a 30-year-old Edmonton man, into custody and he is believed to have acted alone.
Knecht said an Islamic State flag was found in the car that hit the officer, and Prime Minister Justin Trudeau of Canada called it a terror attack.
‘‘To the best of our knowledge, this was a lone wolf attack,’’ Mayor Don Iveson of Edmonton said.
The incident took place outside a Canadian Football League game at Commonwealth Stadium on Saturday night.
Knecht said the suspect fled on foot after the stabbing. The officer was taken to a hospital and treated for injuries that were not life-threatening, and Knecht said his condition was ‘‘not critical.’’