Four people were killed and several seriously injured on Interstate 10 in Southern California near the Arizona border when a passenger bus swerved to avoid the spilled load of a jackknifed truck and overturned.
Caltrans spokeswoman Terri Kasinga says the crash occurred shortly after 2 a.m. Wednesday just west of Blythe when a big rig traveling east jackknifed onto the median and spilled a load of steel pipes into all lanes.
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She said the bus either swerved to avoid the pipes or struck them and overturned onto the shoulder and slid 50 feet down a slight embankment. The bus was traveling from Phoenix to Los Angeles, according to The Associated Press.
Kasinga said four people are dead but there could be more fatalities.
Emergency helicopters transported several passengers with critical injuries.
Kasinga said all lanes of the interstate would be closed for several hours.
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