A police officer was stabbed Saturday evening near the Commonwealth stadium in Edmonton, Canada.
Knecht said based on the evidence at the scene and the actions of the suspect "it was determined that these incidents are being investigated as acts of terrorism under section 83.2 of the criminal code".
Knecht said an Islamic State group flag was found in the auto that hit the officer.
Canadian police have arrested a Somali man who struck a police officer with a auto outside a sports stadium in Edmonton and then repeatedly stabbed the officer before fleeing the scene.
He then jumped out of the auto and stabbed the cop "several times" and fled on foot as a dramatic manhunt was launched. The officer was then transported to hospital with various injuries.
At least four people on the street were hit and injured.
Edmonton Police Chief Rod Knecht said officers have one person in custody and think he acted alone, but are not ruling out that others may be involved.
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Trudeau said in an official statement after the attack, where a terror angle is suspected to have a role. A 30-year-old suspect is in custody.
A police officer was standing at a traffic barricade when a man driving a white auto crashed through the barricade and into the police officer sending him 15ft into the air.
Royal Canadian Mounted Police (RCMP) assistant commissioner Marlin Degrand confirmed at a press conference Sunday afternoon that the suspect has been on the RCMP radar since a complaint was filed in 2015 that the accused may have been radicalized. The police got the flag of the Islamic State from inside the van. He estimated 30 police cars were chasing the U-Haul.
Sharif has been the subject of a police investigation in the past.
Subsequently, a van was stopped at a checkpoint, and the name of the driver appeared to be similar to the name of the registered owner of the auto that hit the officer.
A few hours later, while fans filed out of the game and were re-routed around the crime scene, a U-Haul cube van was stopped at a checkstop north of downtown.
Members of Edmonton's Muslim community were dismayed at the attacks. "We know that Canada's strength comes from our diversity, and we will not be cowed by those who seek to divide us or promote fear", he said.