BART Police received several 911 emergency calls reporting a male was assaulted and kicked in the head by a group of 5-6 juveniles. Officers responded "Code 3", arrived at the Richmond Station and located the victim who was transported to a local hospital for his injuries. Officers searched the area for the juveniles but were unable to locate them. During the investigation, the crime was determined to have occurred in Richmond Police Department's jurisdiction and they were notified. BART Police completed a supplemental report and all information was forwarded to Richmond Police. Station video was requested.