At least three people were killed in a shooting in Montreal, Canada, on Monday, including a police officer, a civilian, and the gunman himself. The attack occurred in the Côte-des-Neiges neighborhood, a partly Jewish-populated area with kosher markets and restaurants. Police responded around 11:30 a.m. after reports of an active shooter firing from inside a building with a long gun. The gunman was later killed in an exchange of fire with police.

Authorities have not yet confirmed the motive or whether the attack was a hate crime or terrorism-related. French-language public broadcaster Radio-Canada reported that the suspect may have been linked to the so-called “incel” ideology, which has been associated with previous acts of violence in Canada. Montreal Police Chief Fady Dagher described the incident as a “tragedy” and a “nightmare.”

Prime Minister Mark Carney expressed deep sorrow over the violence, saying he was heartbroken by the event. Details about the slain civilian have not yet been released, while a female police officer injured in the shooting is now out of danger.