The province's Special Investigation Unit has been called in after a man was injured in a Walmart parking lot.
The police watchdog says the incident happened Wednesday around 3 p.m. in the Erin Mills Parkway and Burnhamthorpe Road West area.
They say Peel Regional Police were called for a report of a man with a weapon. There was an interaction with police and the SIU says an officer used his conducted energy weapon.
The 24-year-old man was taken to hospital with a head injury.
The SIU is urging anyone with information about the investigation to contact the lead investigator at 1-800-787-8529.