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One person was killed and another was injured in a four-vehicle chain reaction crash involving several semitrucks on the 10 Freeway in West Covina early Thursday morning, California Highway Patrol said.

The crash, which resulted in the hourslong closure of all eastbound lanes, was reported shortly before 3 a.m. on the freeway just west of Citrus Street.

Authorities had the eastbound lanes of the freeway closed for a previous crash when an approaching truck pulling two trailers failed to stop in time, CHP Officer Rodrigo Jimenez said.

The big rig rear-ended and pushed forward another truck, which crashed into a third big rig that then hit a Honda Civic stopped in front of it, Jimenez said.

The driver of the first big rig sustained major injuries and the driver of the truck he crashed into was pronounced dead at the scene, Jimenez said.

The other two drivers involved were not injured, according to CHP.

The chain reaction crash resulted in a diesel fuel spill on the roadway, Caltrans said.

By 10:20 a.m., three eastbound lanes were reopened for morning traffic, according to CHP. All lanes were reopened about 1 p.m., officials said.

Video from the scene showed firefighters working to free one truck driver who appeared trapped in a badly-damaged semitruck, while medics treated another truck driver who was wearing a neck brace and appeared to have suffered injuries to his arms and legs.

At least two big rigs appeared to be badly damaged. One truck’s front was completely caved in and another’s had a gaping hole, video showed.

Authorities did not provide information on the person who was killed in the crash.

No further details were immediately available.