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 passenger for interstate travel and that it had no crashes in the past two years.
A call to the company was not immediately returned.
The California crash comes less than a day after a bus carrying 42 high school students and their chaperones slammed into an overpass in Boston. Massachusetts state police said 35 people were injured and that the driver had directed the bus onto a road with a height limit.
Associated Press writers Andrew Dalton in Los Angeles, and Amanda Kwan and Bob Seavey in Phoenix contributed to this report.