A delivery truck ploughed into a bus carrying American students in northern California, killing ten people and injuring at least 30, the California Highway Patrol said.
The bus was one of three bringing high school students to tour Humboldt State University on Thursday, which is about a six-hour drive north of San Francisco.
"My understanding is the FedEx truck crossed the highway divide, and it was a head on collision with our bus," Joyce Lopes, a university official, told AFP. The other two buses arrived safely.
The university said the dead included the drivers of the two vehicles.
The identities of the other victims were not immediately released.
"Students were transported to six different hospitals, because it was a fairly remote place ... where the accident occurred," Lopes explained, adding it was taking time to track down each student.
The university is in Arcata, California, not far from the border with Oregon to the north and the crash happened in Orland, about 125 miles (200 kilometers) to the southeast.