Bus overturns in California mountains, sending multiple people to the hospital

(KTLA) -- Three dozen people were aboard a bus involved in a fiery crash in California's San Bernardino Mountains on Sunday night, prompting firefighters to declare a mass casualty incident.

Details were limited, and the exact cause of the crash is unknown. However, preliminary reports indicate that officials with the California Highway Patrol, the San Bernardino County Fire Department and other surrounding agencies responded just before 9 p.m. to reports of an overturned bus on State Route 330 in the Fredalba neighborhood of Running Springs, California.

One witness who was following the bus and knew many of the occupants involved in the crash told OnScene.TV, a video news service, that the young people aboard the vehicle had attended a church event and were on their way back to the chur