MISSISSAUGA, Ont. -- A York Regional Police officer has been charged with sexual assault.

Ontario's police watchdog says the incident occurred on Jan. 4 when a 21-year-old woman was pulled over for a traffic stop.

The Special Investigations Unit says they received a complaint of a sexual nature that same day.

Const. Young Min von Seefried has been charged with sexual assault and is scheduled to appear in a Newmarket court on July 21.

None of the allegations have been proven in court.

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