Barrie police are looking for a sexual predator after a teenaged girl was attacked inside a high school washroom.

The male suspect may have been wearing school colours to avoid being detected inside St. Joan of Arc High School on Mapleton Avenue, police said.

The 16-year-old girl was attacked in the middle of the day Monday. She was treated at hospital for minor injuries.

Police are concerned because it was a serious assault and they fear the man could strike again.

The suspect, who was a stranger to the victim, fled after the attack, possibly in a vehicle.

Crisis response staff were scheduled to attend the high school Tuesday to deal with any student concerns. School officials are also reviewing security procedures.

Young girls are being cautioned to travel in groups, and to call police from a secure location if they encounter anyone suspicious.

About 1,300 students attend the school.

The suspect is described as white, in his late teens or early 20s, about 5-foot-5 with a thin build. He is clean-shaven with blue eyes, a pockmarked face and a deep crackling voice. He was wearing a white golf shirt and baggy blue pants.

Anyone with information is asked to call Barrie police at 705-725-7025 or Crime Stoppers at 1-800-222-TIPS (8477).