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.

Vancouver police ruled out terrorism as a motivator for the incident at the Lapu Lapu Day Festival, saying the suspect has a history of mental health issues.

A man drove a vehicle into a crowd at a Filipino heritage festival in the Canadian city of Vancouver, killing at least nine people and injuring an unknown number of others, police said Sunday.