Edmonton Police did not immediately identify the 30-year-old suspect, but said it was likely he acted alone.
"Suddenly and without notice and at a high rate of speed a male driving a white Chevrolet Malibu crashed through the traffic barricades that were separating vehicles from pedestrians", said Edmonton Police Service Chief Rod Knecht in an early morning press conference.
According to police, a police officer controlling traffic at a Canadian Football League game was struck by a auto at high speed and then attacked with a knife multiple times by the driver who then fled abandoning the vehicle. The officer was hospitalized but his injuries are not thought to be life-threatening.
Canadian police said an attack on an officer outside a football game with a auto and knife, and a high-speed chase of a U-Haul van that left four other people injured in the western city of Edmonton, Alberta, are being investigated as acts of terrorism.
Information about the vehicle's registered owner was broadcast to patrol officers, said Knecht.
The truck deliberately attempted to haul pedestrians along Jasper Avenue, one of the busiest streets in the downtown area on Saturday night.
Four people were hurt.
He said 30 police cars were chasing the U-Haul.
Police say the incidents "may be related" and are investigating both as acts of terrorism.
Degrand said files on the suspect were kept and shared with other intelligence and police agencies after 2015, but said that was as much as the law would allow.
As Vegas shooting news shows, Google and Facebook are failing you
But both Facebook's and Google's statements refuse to reckon with the problems these automated systems have created. However, its removal was delayed by a few minutes, allowing it to be screen captured and circulated online.
The driver got out, pulled out a large knife and began stabbing Chernyk, a ten-year veteran, as he was lying on the ground.
The CBC reported Mr. Sharif worked on a construction crew at one point, and quoted an unnamed former colleague saying Mr. Sharif was sympathetic to the Islamic State, prone to religious rants about "polytheists" and expressed "genocidal beliefs".
Its terror threat level remained at medium, where it has been since late 2014.
Elgie said the van hit a man who was a bar customer.
Edmonton police Insp. Carlos Cardoso was asked by reporters why authorities did not broadcast the name and details of the suspect to the general public after Chernyk was attacked, given the incident had the earmarks of a terrorist attack and happened near a major sporting event.
"I didn't do anything, and I drove", she said.
"The constable is doing surprisingly well and is receiving support from the Edmonton Police Service and his family", he said.
"There were like 10 cop cars following him ..."
It ended when the van rolled near a downtown hotel and the suspect was arrested.
"We can not - and will not - let violent extremism take root in our communities", Mr. Trudeau said. It was insane. It just came around the corner, ripping.