PALM SPRINGS, CALIFORNIA — Several people were killed and dozens more injured in a bus crash in California on Sunday morning. <br /> <br />The Desert Sun reports that a USA Holiday tour bus was returning to Los Angeles from the Red Earth Casino near the Salton Sea early Sunday. <br /> <br />It was 5 a.m., and almost all of the 43 passengers on board were asleep. As the bus drove westbound along Interstate 10, it crashed hard into a semi-truck just near Palm Springs. <br /> <br />The bus plowed about 15 feet into the semi, completely demolished the front of the vehicle. Thirteen people died as a result, including the driver. <br /> <br />Thirty-one others survived the terrifying ordeal. They were rescued from the wreckage and treated for their injuries. <br /> <br />Authorities are investigating the crash and have yet to determine whether it was caused by a mechanical failure, or by the driver falling asleep or suffering an attack.
