Last Updated 11:25 a.m. ET
YUCAIPA, Calif. At least seven people were killed and 38 injured Sunday when a tour bus careened out of control while traveling down a Southern California mountain road, struck a car, flipped and plowed into a pickup truck, authorities said.}
The accident occurred around 6:30 p.m. about 80 miles east of Los Angeles and left State Route 38 littered with debris, the bus sideways across the two lanes and its front end crushed.
Authorities lowered the death count from 8 to 7 on Monday.
Emergency crews worked to free passengers who were trapped in the bus, which was returning to Tijuana, Mexico, California Highway Patrol spokesman Mario Lopez said.
A representative of the Mexican consulate was on-scene, reports CBS Los Angeles Station KCBS, citing the California Department of Transportation (Caltrans).
The violence of the crash and severity of the injuries made for a chaotic scene, and authorities had a difficult time determining how many people were injured or killed. Lopez said at least seven and perhaps 10 were dead, and 38 transported to hospitals.
Caltrans spokeswoman Michelle Profant said the scene was shocking.
"It's really a mess up there with body parts," she said.
The bus driver survived and told investigators the bus suffered brake problems as it headed down the mountain, Lopez said. It rear-ended a sedan and flipped, then struck a pickup truck pulling a trailer.
Lettering on the bus indicated that it was operated by Scapadas Magicas LLC, a company based in National City, Calif. Federal transportation records show that the company is licensed to carry passengers for interstate travel and that it had no crashes in the past two years.
A call to the company was not immediately returned.
Jordi Garcia, a manager for InterBus Tours, said his company ran Sunday's trip. He told U-T San Diego that 38 people departed Tijuana at 5 a.m. for a day of skiing at Big Bear.
"The information that we have is that the bus' brakes failed and the accident occurred," he said.
Route 38 runs through the San Bernardino National Forest and leads to Big Bear. The accident occurred as the bus was headed south and leaving the forest.
Patients were taken to several area hospitals with injuries ranging from minor to life-threatening.
The National Transportation Safety Board said Monday it was sending a team to the crash.
The California crash comes less than a day after a bus carrying 42 high school students and their chaperones. Massachusetts state police said 35 people were injured and that the driver had directed the bus onto a road with a height limit.