Police had contact with the suspect a day before he got behind the wheel of an SUV and drove it into the crowd at a Filipino festival in Vancouver, killing 11 people, authorities said Monday.

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.

30-year-old Kai-Ji Adam Lo was charged with eight counts of second-degree murder in a Vancouver courtroom on Sunday, April 27 in relation to an attack that took place on April 26, which left at least 11 dead.