A patron was on a train when an unknown suspect grabbed the patron's iPhone6 and fled with the loss. The patron attempted to chase the suspect, but was not able to retrieve his property. The suspect was last seen on a SF bound train which was searched at Rockridge station, but the suspect and the loss were not located. The suspect was described as a Hispanic male, late teens, 5'4" tall, thin build with wavy hair and wearing jeans and carrying a grey Jansport backpack. The patron's backpack, which was dropped during the incident, was turned in to the station agent at Pleasant Hill.