10 people were killed and 15 were injured on Monday when a white rental van plowed into pedestrians in Toronto.
Eyewitnesses said the van mounted the curb on Yonge Street near Finch Avenue, in North York, just before 1:30 p.m. local time.
The van fled the scene after hitting the pedestrians. Police were able to stop the driver a few blocks away.
Footage from the scene showed the driver pointing what appeared to be a gun at police before he was ordered to drop it and being arrested.
The driver has been identified as Alek Minassian, a 25-year-old resident of Richmond Hill, located north of Toronto.
Minassian was reportedly not connected to any terrorist group. While the motive for the incident is not yet clear, a local law enforcement official said the ramming appeared to be deliberate.
Public Safety Minister Ralph Goodale said he cannot confirm whether the incident is being treated as a terror incident, but he referred to it as an "attack".
Toronto Mayor John Tory, speaking at the scene of the incident, asked people not to come to the area while the investigation is ongoing. Businesses and buildings have been asked to close.
He added there would likely be several days of disruption as the investigation continues.
Canadian Prime Minister Justin Trudeau told CTV: “Obviously, we’re just learning of the situation in Toronto. Our hearts go out to anyone affected. We’re obviously going to have more to learn, more to say in the coming hours."