* Truck loses control, smashes head-on into bus
* High school students were going to visit university
* More than 30 injured in crash north of Sacramento (Adds quotes from survivor, details about crash aftermath, background)
By Dan Whitcomb
LOS ANGELES, April 11 (Reuters) - Ten people died, many of them high school students, when a truck slammed into a tour bus with college hopefuls heading to a campus tour in northern California on Thursday, police said.
Five students, three chaperones and the drivers of bus and FedEx truck were killed, according to the California Highway Patrol and Humboldt State University, which was to host the students' visit.
The tenth fatality was confirmed by a CHP spokeswoman early Friday as a chaperone on the tour bus.
"All of a sudden I heard people screaming," 17-year-old Jonathan Gutierrez told NBC's "Today" show, saying he had been asleep before the impact.
Gutierrez, who suffered cuts on his face, said the aisle of the tour bus filled with smoke and students broke windows to escape. "It was a very surreal moment," he said.
More than 30 people were hurt after the driver of the FedEx truck lost control, jumped a divider on Interstate 5, side-swiped a car and smashed head-on into the bus Thursday evening, CHP spokeswoman Tracy Hoover said.
"They are traumatized, absolutely," Hoover said of the injured. "Most of them have scratches, cuts, burns, contusions and lacerations - a magnitude of injuries."
About 34 people were taken by air and land ambulances to area hospitals in varying conditions, police said.
No one in the car that was side-swiped was killed, though the driver was sent to hospital with unspecified injuries.
The highway was closed in both directions and was not expected to reopen until early Friday.
Apart from the driver, the bus was carrying between 44 and 48 students and several chaperones to the university for a campus tour, CHP spokeswoman Lacey Heitman said.
The crash took place near the city of Orland, 95 miles (150 km) north of Sacramento.
The students, traveling from Los Angeles-area high schools, were part of a program Humboldt State said "brings low-income and first-generation prospective college students from the Los Angeles and San Francisco areas to HSU's campus."
Pictures from the scene showed the bus reduced to a burned-out chassis resting sideways across the highway. Yellow tarps appeared to be draped over bodies in the wreckage.
'HARDLY ANYTHING LEFT'
Hoover described hunks of twisted metal and broken glass and said flames had roared through the vehicles.
"The big rig and the bus were both engulfed in flames. You are talking about two vehicles that are destroyed. There is hardly anything left of the truck," Hoover said.
Two other charter buses that were also carrying students to Humboldt - one from the Los Angeles area and one from the Fresno area - had arrived safely, the university said.
Bonnie Kourvelas, a spokeswoman for FedEx Corp, said the company was aware that one of its trucks was involved in the crash.
"We are cooperating fully with authorities as they investigate," she said.
Some of the students were from Manual Arts Senior High School, Robert F. Kennedy Community Schools and Banning High School, said Los Angeles Unified School District spokesman Tom Waldman.
Humboldt State President Rollin Richmond said students from southern California had been traveling to the college campus for a spring preview event on Friday.
"Our hearts go out to those who have been affected, and we are here to support them, and their families, in any way possible," he said in a written statement.
The students were to visit the campus for two days and stay in residence halls, the university said. (Reporting by Dan Whitcomb in Los Angeles and Eric Johnson in Seattle; Additional reporting by Laila Kearney in San Francisco and Colleen Jenkins in North Carolina; Editing by Tom Heneghan and Bernadette Baum)