updated 5/6/2010 9:32:52 PM ET 2010-05-07T01:32:52

A big rig carrying scores of cows has overturned on Interstate 10 in Southern California, killing at least 40 and forcing the closure of lanes for several hours.

California Highway Patrol officials say the tractor-trailer flipped over at about 2:30 p.m. Thursday in Redlands.

Officer Hope Maxson says the truck was carrying about 160 young cows. None were on the roadway, but many were injured.

She says crews cut off the top of the trailer to pull out the remaining live animals, which were mooing loudly.

San Bernardino County Animal Control Chief Brian Cronin says veterinarians are examining the animals and removing the dead.

Maxson says the driver swerved, overcorrected and tipped the trailer over onto a pickup truck, narrowly missing the driver.

No humans were hurt.

Copyright 2010 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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