At around 3:10 p.m., a 13-year-old girl walking on Niles Avenue near Beech Avenue told police she saw a naked man inside a parked car, according to the San Bruno Police Department.
The man, who was reportedly sitting in the driver seat, did not attempt to make any contact with the teenager.
The suspect was described as a white man with brown crew-cut hair. The vehicle in which he was seen was a green older car with a beige or gray interior, according to police.
Anyone who might have information regarding the case is asked to call the San Bruno Police Department at (650) 616-7100.