An Ontario Provincial Police officer is facing an assault charge in connection with an incident in Toronto on Canada Day that left a man with a concussion.

The province’s police watchdog said a 19-year-old man from Oshawa was heading south on Highway 400 around 12:30 a.m. on July 1, when he ran into car trouble. He pulled over on the shoulder in the eastbound collector lanes of Highway 401 near Jane Street.

The Special Investigations Unit (SIU) said two OPP officers were called to the scene and the man was injured during the interaction. He was later diagnosed with a concussion.

The SIU said it has reasonable grounds to believe one of the officers assaulted the man.

OPP Const. Scott Hearnden is charged with assault causing bodily harm. He is scheduled to appear in court on Feb. 10.

The SIU is an arm’s length agency that investigates reports involving police where there has been death, serious injury or allegations of sexual assault.