Police searched Saturday for three suspects involved in a robbery that erupted in gunfire at a medical marijuana dispensary, leaving one of the gunmen fatally injured The shootout occurred shortly after 11:30 a.m. Friday as employees and the store owner were preparing to open Natural Source and were met by five gunmen armed with semiautomatic rifles. The robbers forced the employees inside, then began taking marijuana and cash, said Lt. Dale Amaral of the Alameda County Sheriff's Department