Six people were killed early Thursday morning in a Greyhound bus accident on Highway 99 near Fresno, California. Another 34 were injured, four of them critically.

The Sacramento-bound bus, which left Los Angeles late Wednesday and had stopped in Fresno shortly before the fatal accident occurred at around 2:15 a.m., a Greyhound spokesperson said. The bus hit an overturned Chevy Trailblazer in the fast lane, and then hit a Honda CRV, according to CNN. All three vehicles went down an embankment and the bus slammed into a large eucalyptus tree, California Highway Patrol officer Kirk Arnold said.

The bus driver — 57-year-old James Jewett of Sacramento – was killed, along with another man and four women.

Taxi driver Mike Coupland, who witnessed the accident, said the SUV had no lights on and that the bus driver did not have time to stop.

“He didn’t have time to hit his brakes. He just plowed right into it,” Coupland said. He also told reporters the bus driver “was doing nothing wrong.  He was going the speed limit, he was being safe. There was nothing he could have done to avoid it. Nothing at all.”

CHP officer Matt Radke told the AFP news agency that nine people with major injuries were taken to the Community Regional Medical Center in Fresno and at least 24 others also were injured, though not as seriously.  Authorities are still trying to determine how many people were on the bus. The CHP had a manifest stating that 47 people were on the bus but a Greyhound spokesperson said there were only 35.

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