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Massive flames engulf a tractor-trailer and a tour bus just after they collide on Interstate 5, Thursday April, 10, 2014, near Orland, Calif. At least 10 people were killed in the crash, authorities said. (AP Photo/Jeremy Lockett) ( California Bus Crash )

California Highway Patrol officer Joe Stokes clears away crime scene tape at the scene of a deadly crash on April 11, 2014 in Orland, California. Ten people were killed and dozens injured, including four still in critical condition, after a FedEx truck collided with a bus of high school students on Interstate 5 yesterday. The students were on their way to visit Humboldt State University in Northern California. (Photo by Elijah Nouvelage/Getty Images) ( 484186431 )

A bus involved in Thursday's deadly crash is loaded on to a truck at the scene on April 11, 2014 in Orland, California. Ten people were killed and dozens injured, including four still in critical condition, after a FedEx truck collided with a bus of high school students on Interstate 5 yesterday. The students were on their way to visit Humboldt State University in Northern California. (Photo by Elijah Nouvelage/Getty Images) ( 484186427 )

Officials and California Highway Patrol Officers look over the remains of a tour bus that was struck by a FedEx truck on Interstate 5 Thursday in Orland, Calif., Friday, April 11, 2014. At least ten people were killed and dozens injured in the fiery crash between the truck and a bus carrying high school students on a visit to a Northern California College. (AP Photo/Jeff Chiu) ( California Bus Crash )

California Highway Patrol Lt. Commander Bruce Carpenter speaks at a press conference on April 11, 2014 in Willows, California. Ten people were killed and dozens injured, including four still in critical condition, after a FedEx truck collided with a bus of high school students on Interstate 5 yesterday near Orford, California. The students were on their way to visit Humboldt State University in Northern California. (Photo by Elijah Nouvelage/Getty Images) ( 484181289 )

Los Angeles Mayor Eric Garcetti, right, embraces Los Angeles Schools Superintendent John Deasy John Deasy at news conference Friday, April 11, 2014, in Los Angeles, concerning the bus crash that claimed the lives of 10 students in Northern California. (AP Photo/Nick Ut) ( California Bus Crash )

CalTrans District 3 PIO Deanna Shoopman speaks at a press conference on April 11, 2014 in Willows, California. Ten people were killed and dozens injured, including four still in critical condition, after a FedEx truck collided with a bus of high school students on Interstate 5 yesterday near Orford, California. The students were on their way to visit Humboldt State University in Northern California. (Photo by Elijah Nouvelage/Getty Images) ( 484180995 )

California State University Chancellor Timothy White (R) and Los Angeles Unified School District Senior Deputy Superindendent Michelle King (L) listen during a press conference on April 11, 2014 in Willows, California. Ten people were killed and dozens injured, including four still in critical condition, after a FedEx truck collided with a bus of high school students on Interstate 5 yesterday near Orford, California. The students were on their way to visit Humboldt State University in Northern California. (Photo by Elijah Nouvelage/Getty Images) ( 484180975 )

Amanda Martinez and her dog Taffy watch workers clear the scene of Thursday's deadly crash on April 11, 2014 in Orland, California. Ten people were killed and dozens injured, including four still in critical condition, after a FedEx truck collided with a bus of high school students on Interstate 5 yesterday. The students were on their way to visit Humboldt State University in Northern California. (Photo by Elijah Nouvelage/Getty Images) ( 484186433 )

A passenger car involved in a multi-vehicle accident that left at least ten people dead and dozens injured, sits on tow truck on Interstate 5, Friday, April 11, 2014 in Orland, Calf. A FedEx truck traveling on southbound Interstate 5, Thursday, veered across a grassy highway median and slammed into the bus that was carrying 40 high school students on a visit to a Northern California College. (AP Photo/Rich Pedroncelli) ( California Bus Crash )

Candles and flowers are seen at a make-shift memorial, Friday, April 11, 2014, for the victims of a multi-vehicle accident that included a tour bus and a FedEX truck crashed on Interstate 5 in Orland, Calif. Ten people were killed and dozens injured in the fiery crash, Thursday, between the truck and a bus seen in background, carrying high school students on a visit to a Northern California College.(AP Photo/Rich Pedroncelli) ( California Bus Crash )

Sergio Parra, 16, a 10th grader at Orland High School, cleans the glass on the school's sign, Friday, April 11, 2014, after placing a memorial remembering the victims of a fiery crash between a tour bus and a FedEx truck in Orland, Calif. Ten people were killed and dozens injured in the fiery crash that happened Thursday, between the truck and a bus carrying high school students on a visit to a Northern California college. Orland High is across the street from where a Red Cross shelter was setup to handle some of survivors of the accident. (AP Photo/Rich Pedroncelli) ( California Bus Crash )

A pair of California Highway Patrol Officers walk past the burned out tour bus where at least nine people died in a fiery crash between a tour bus and a FedEx truck on Interstate 5 Thursday, April 10, 2014, in Orland, Calif. (AP Photo/Rich Pedroncelli) ( California Bus Crash )

Rescuers tend to walking wounded after a fiery crash involving several vehicles, Thursday, April 10, 2014, just north of Orland, Calif., that left at least nine dead. Authorities said it is not yet clear what caused the crash but that it involved a tour bus, a FedEx truck and a Nissan Altima. (AP Photo/The Chico Enterprise-Record, Dan Reidel) ( APTOPIX California Bus Crash )

A California Highway Patrol Officer inspects the demolished cab of a FedEX truck that crashed into a tour bus in an fiery accident that claimed at least nine lives including the driver of the truck on Interstate 5 Thursday, April 10, 2014,in Orland, Calif. (AP Photo/Rich Pedroncelli) ( California Bus Crash )

Firefighters hose down the wreckage of a bus and a semitruck that collided, Thursday, April 10, 2014, just north of Orland, Calif., that left at least nine dead. Authorities said it is not yet clear what caused the crash but that it involved a tour bus, a FedEx truck and a Nissan Altima. (AP Photo/The Chico Enterprise-Record, Dan Reidel) ( California Bus Crash )

Rescue workers, police and firefighters work the scene where nine people were killed in a three-vehicle crash involving a bus carrying high school students on a visit to a college, Thursday, April 10, 2014, near Orland, Calif. Authorities said it is not yet clear what caused the crash but that it involved a tour bus, a FedEx truck and a Nissan Altima. (AP Photo/The Record Searchlight, Greg Barnette) ( California Bus Crash )

Rescue workers, police and firefighters work the scene where nine people were killed in a three-vehicle crash involving a bus carrying high school students on a visit to a college, Thursday, April 10, 2014, near Orland, Calif. Authorities said it is not yet clear what caused the crash but that it involved a tour bus, a FedEx truck and a Nissan Altima. (AP Photo/The Record Searchlight, Greg Barnette) ( California Bus Crash )

Rescue workers, police and firefighters work the scene where nine people were killed in a three-vehicle crash involving a bus carrying high school students on a visit to a college, Thursday, April 10, 2014, near Orland, Calif. Authorities said it is not yet clear what caused the crash but that it involved a tour bus, a FedEx truck and a Nissan Altima. (AP Photo/The Record Searchlight, Greg Barnette) ( California Bus Crash )

Emergency crews look over wreckage from a crash between a semi and a tour bus on Thursday, April 10, 2014, on Interstate 5 near Orland, Calif. Authorities said it is not yet clear what caused the crash but that it involved a tour bus, a FedEx truck and a Nissan Altima. At least Nine people were killed Thursday and dozens injured in the fiery crash between a FedEx delivery truck and a charter bus carrying high school students on a visit to a Northern California college, authorities said. (AP Photo/The Record Searchlight, Greg Barnette) ( California Bus Crash )

In this photo provided by Andrew Hutchens, authorities work the scene where nine people were killed in a three-vehicle crash involving a bus carrying high school students on a visit to a college, Thursday, April 10, 2014, near Orland, Calif. Authorities said it is not yet clear what caused the crash but that it involved a tour bus, a FedEx truck and a Nissan Altima. (AP Photo/Andrew Hutchens) ( APTOPIX California Bus Crash )

A school bus arrives to transport victims to a Red Cross shelter in Orland, Calif., after a charter bus carrying high school students, a FedEx truck and a Nissan Altima crashed on Interstate 5 killing at least nine people Thursday, April 10, 2014, near Orland. Authorities said it is not yet clear what caused the crash but that it involved a tour bus, a FedEx truck and a Nissan Altima. (AP Photo/The Record Searchlight, Greg Barnette) ( California Bus Crash )