TORONTO - Ontario's police watchdog says it will investigate evidence suggesting an officer fired his gun during a deadly incident in Bourget, Ont., last week.

The Special Investigations Unit says it has invoked its mandate to investigate the police firearm discharge during a shooting that left one Ontario Provincial Police officer dead and two others injured.

According to OPP, 42-year-old Sgt. Eric Mueller and two other officers were “ambushed” and shot at when they responded to a call for a disturbance at a Bourget home on May 11. Mueller died in hospital after the shooting.

A 39-year-old man is charged with one count of first-degree murder and two counts of attempted murder in the case.

The SIU says it was notified by an OPP forensic team that one of the surviving officers may have discharged his firearm during the shooting.

The SIU says no one was struck when that gun was fired.

This report by The Canadian Press was first published May 16, 2023.