It was unclear what, exactly, caused the horrific bus crash in Southern California that has injured 42 and left at least eight people dead, though authorities expect that number to rise. “It’s a horrific scene,” says Highway Patrol spokesman Mario Lopez. “Probably one of the worst ones I have seen in my career. There are victims inside the bus, outside the bus, personal belongings [everywhere].” Police have yet to get inside the bus to assess the full extent of the damages …