A driver plowed a car into a crowd at a street festival celebrating Filipino heritage in Vancouver on Saturday night, killing at least 11 people and injuring dozens more in what police are calling “the darkest day” in the city’s history.

Some of those attending the festival helped chase down and detain the suspect, who police identified as a 30-year-old man who had a history of mental health-related interactions with authorities.

Police said the ages of those killed range from five to 65. “Dozens more are injured, some critically, and some have not yet been identified,” Vancouver Police interim chief Steve Rai said in a Sunday press conference.

The event on Saturday was intended as a celebration of culture and diversity, marking Lapu Lapu Day, an annual festival organized by British Columbia’s Filipino community and commemorating an Indigenous leader who fought against Spanish colonization.

Food trucks lined the street as performers broke out in traditional Filipino dance in the spring sunshine. Yet the family-friendly event ended in horror: one witness described it as like a war zone, with bodies seen lying in the street.

“The actions of a single person shattered our collective sense of safety. It is impossible to overstate how many lives have been impacted forever by this lone individual, Rai told reporters on Sunday.

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No motive has been given, although police say there is no indication the incident was an act of terrorism.

“It would appear that mental health appears to be the underlying issue here,” Vancouver mayor Ken Sim said.

In a press briefing on Sunday morning local time, Canadian Prime Minister Mark Carney said he was “deeply heartbroken” over the attack - which came ahead of Monday’s election - while stressing authorities do not believe there is any “active threat” to Canadians.

Carney confirmed that nine people were killed and more than 20 were injured “in what Vancouver police are describing as a car ramming attack.”

He continued, “Last night, families lost a sister, a brother, a mother, a father, a son or a daughter. Those families are living every families’ nightmare.”

The incident unfolded just after 8 p.m. local time when a man drove a black Audi SUV into a large crowd of people attending the Lapu Lapu Day Festival near East 43rd Avenue and Fraser Street,” police said. The male suspect, who is from Vancouver, was arrested at the scene.

Rai said the suspect was thought to have operated alone, was the sole occupant of the vehicle, and remains in custody. Police are not publicly identifying the suspect as he has not yet been charged.

The investigation, led the Vancouver Police Department’s Major Crime Section, is ongoing and police have asked members of the public to contact them with any information about the incident.

Eyewitnesses who attended the street festival described scenes of chaos.