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A rental truck lies on its side in Edmonton, Canada, on October 1, 2017, after a high speed chase.
Canadian police arrested a man early Sunday suspected of stabbing an officer and injuring four pedestrians in a series of violent incidents being investigated as an "act of terrorism." The crime spree began late September 30 outside a football stadium and ended hours later with a high speed chase in which the driver of the rented truck plowed into pedestrians, police said.
 / AFP PHOTO / Michael MUKAI        (Photo credit should read MICHAEL MUKAI/AFP/Getty Images)
A rental truck lies on its side in Edmonton, Canada, on October 1, 2017, after a high speed chase.
Canadian police arrested a man early Sunday suspected of stabbing an officer and injuring four pedestrians in a series of violent incidents being investigated as an "act of terrorism." The crime spree began late September 30 outside a football stadium and ended hours later with a high speed chase in which the driver of the rented truck plowed into pedestrians, police said.
 / AFP PHOTO / Michael MUKAI        (Photo credit should read MICHAEL MUKAI/AFP/Getty Images)

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Canadian authorities say two incidents in Edmonton are being investigated as acts of terrorism after a man struck a police officer with a car before stabbing him and later plowed a truck into pedestrians on a busy street, injuring at least four people.

ISIS flag found in Edmonton attack vehicle

Canadian authorities say two incidents in Edmonton are being investigated as acts of terrorism after a man struck a police officer with a car before stabbing him and later plowed a truck into pedestrians on a busy street, injuring at least four people.