Rescuers pulled out "bags of body parts" from the survivors of the crash on State Route 99, where the speeding bus hit the pole of a highway exit sign head-on, Merced County Sheriff Vern Warnke said.
It sheared straight through bus, stopping at the first rear axle "with a great impact," he said.
Emergency workers climbed in through the windows to pull out trapped passengers. Others were ejected and were lying in a ditch, Warnke said.
"The pole went through the center of the bus, and that's where the injuries were sustained," Onsurez said.
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The still-intact sign stuck out from the roof of the crumpled bus. Wreckage and debris including seat cushions, drink containers, pillows and a blanket were scattered in lanes and on the shoulder of the highway a few miles south of the town of Livingston.
Onsurez identified the driver as Mario David Vasquez of the Los Angeles area, the Merced Sun-Star reported. The 57-year-old was among those with major injuries and was airlifted to a hospital, the newspaper said.
Calls to various telephone listings for the company went unanswered. Its counter was open at a Los Angeles depot, but nobody was present when an Associated Press reporter arrived midmorning.
A sign in Spanish advertised daily 7:30 PM departures to destinations up the West Coast to Washington.
The Federal Motor Carrier Safety Administration listed the carrier as having a "satisfactory" rating as of May 17. The bus was inspected in April and had three violations, including a lack of or a defective brake warning device.