The incident happened shortly after midnight Friday near Santa Monica and San Vicente boulevards, according to officials of the Los Angeles County Sheriff's Department.
Chris de la Cruz posted a photo to Facebook after the incident, writing that he was pushed to the ground and punched several times.
De la Cruz said the suspects put a knife to his face, wanted his money and credit cards, and made derogatory homosexual references.
Investigators said there is not yet a description of any suspects.
