A driver plowed into a group of partygoers attending a Filipino street festival on Saturday evening in Vancouver, British Columbia, killing at least 11 people, the city’s interim police chief said, adding that there may be deaths among the “dozens” of people who were injured.

The interim chief, Steve Rai, said on Sunday that a 30-year-old man from Vancouver was in custody, and that the police had previously had “substantive contact with him over mental health issues.” He declined to attribute any motive to the festival attack.

Investigators had ruled out terrorism as a motive, Vancouver police said in an email early Sunday, but they did not offer further details. Prime Minister Mark Carney, who described the incident as a “car-ramming attack,” said that federal national security officials “do not believe that there is any active threat to Canadians.”

Photographs published by news agencies showed what appeared to be a black SUV with significant damage to the front of the vehicle, and its airbags deployed.

“At approximately 8:14 p.m. on April 26, a man drove into a large crowd of people attending the Lapu Lapu Day Festival near East 43rd Avenue and Fraser Street,” the Vancouver police said in a post on social media. The annual event celebrates Datu Lapu Lapu, a national hero in the Philippines.

“As of now, we can confirm nine people have died after a man drove through a crowd at last night’s Lapu Lapu Festival,” the police said in another post on social media early Sunday. “Our thoughts are with all those affected by this tragic incident.”

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