South San Francisco police are searching for a man who walked naked into a high school girls’ locker room Monday night.

Five teenage girls were changing after cheerleader practice in an unlocked South San Francisco High School locker room at about 5:30 p.m. when a man walked in wearing nothing, police said. He made eye contact with the students before leaving without saying a word.

The man was described by the students as having an average build and a “potbelly.” He was white, about 40 years old and 5-foot-9, with balding dark hair. Anyone with information is asked to call Officer William Gablin at (650) 877-8900, or an anonymous tip line at (650) 952-2244.