Two men were taken into custody after a stolen tractor trailer collided with a police cruiser in Brampton on Friday morning.
It happened near McLaughlin Road and Steeles Avenue shortly before 6 a.m.
Peel Regional Police say that the collision resulted after police initiated an investigation into the stolen tractor trailer.
A foot pursuit followed the collision and police say the two men were arrested as a result of that.
According to the Special Investigations Unit, one of the men was bitten by a police dog and a conducted energy weapon was fired.
The suspect was taken to Brampton Civic Hospital for treatment for a neck injury and the dog bite.
The SIU says it has invoked its mandate and is investigating.
Five investigators, two forensic experts and a collision reconstructionist have been assigned to the incident.
Anyone with information is asked to contact the SIU at 1-800-787-8529.
The SIU investigates all reports involving police where there has been death, serious injury or an allegation of sexual assault.