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The officer was rammed by a car outside Edmonton's Commonwealth Stadium, before the attacker fled to target more police and pedestrians.

Soon after, a patrol car was rammed before it chased the lone attacker at high speed through the city.

Police spokesman Scott Pattison said: “The officer was approached by an unknown male suspect in a vehicle, at which time the suspect rammed the police cruiser.

“The suspect got out of his vehicle and an altercation ensued.

"The officer sustained some injuries, he’s in hospital, and thankfully he’s doing OK.”

Edmonton Police Chief Rod Knecht said both incidents are being investigated “as an act of terror”.

The top officer revealed an ISIS flag was discovered in the car used by the attacker.

Four were hit during the police chase.

“There were people flying and everything,” witness Kim Anderson said.

“I’m shocked — I just see people flying.”