Several people are dead after a small plane crashed on Catalina Island Tuesday night, officials confirmed to KTLA.   Details are extremely limited, but crews with the L.A. County Fire and the Avalon Sheriff’s departments began their search just before 8:30 p.m. at El Rancho Escondido Reservoir Road on Catalina, according to an L.A. County FD alert.   (KTLA) It’s unclear where the twin-engine turboprop plane was coming from and whether it might have been attempting to land or take off from Avalon Airport.   Early reports suggest there may have been as many as five people onboard the aircraft, though authorities have not confirmed that number. Officials with the L.A. County Sheriff's Department would only say that several people were deceased. No further details were immediately available. This developing story will be updated when additional details become available.