An officer contacted a 15 year old male victim along with his brother at the Powell St. BART Station. The victim stated that he had just arrived via train from Civic Center Station where he was robbed of his I-Phone. He stated a medium build suspect (BM), 20-25 years old, 5’9 to 6’00 approached him on the platform at Civic Center Station and threatened to shoot him unless he handed over his I-Phone. The victim complied and the suspect told the victim and his brother to get on a train that was at the station. No weapon was seen. The suspect stayed on the platform and fled the station. An area check was negative. (1201-2342) L21.