Nine big-rigs have collided on Interstate 5 at Newhall Pass, closing the southbound truck bypass until about noon Tuesday, according to the California Highway Patrol.
The wrecks occurred about 2:20 a.m. Tuesday inside the truck bypass tunnel located about 25 miles north of downtown Los Angeles. A big-rig overturned inside the tunnel, which apparently started the chain-reaction crashes, the CHP said.
The lanes of the busy highway may have been slickened by late-night rains at the time of the wrecks.
At least one truck driver was trapped in the wreckage and was rescued by firefighters, NBC LA reported.
The southbound, two-lane truck bypass tunnel will be closed until about noon as crews work to clear the wreckage and clean up diesel fuel that spilled, the CHP said.
The pile up involved two separate accidents. The first involved four trucks, including a dump truck. A second collision involved five more trucks, the CHP said.
Traffic is backed up on both Interstate 5 and the 14 Freeway.