An officer intercepted a train at the station for a report of a male creating a disturbance. A male and female victim reported that the suspect had battered them (unprovoked). The female was pushed in the back of the head (declined medical/no visible injuries) and the male was punched numerous times, causing scratching and bruising. The male victim was treated by medical staff at the scene. The victims placed the suspect under citizen's arrest for battery. He was issued a prohibition order before being booked into the San Francisco County Jail for the battery charges and a probation violation.