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A big rig driver was killed in a crash Wednesday morning that sent power lines onto the 10 Freeway in Ontario.

The freeway was temporarily closed in both directions after the truck crashed on the westbound side near Haven Avenue, the California Highway Patrol’s traffic incident log stated. The CHP initially indicated the crash was on the eastbound side of the freeway but later updated the incident log.

The big rig struck a power pole before going over a guard rail and crashing into a drainage ditch, California Highway Patrol Officer Christian Craycraft.

The engine was separated from the truck in the crash and the driver was killed, Craycraft said. The driver’s identity has not been released.

Power lines from the downed pole fell onto the freeway, prompting officials to issue a SigAlert and stop traffic in both directions at about 3:50 a.m.

Eastbound lanes were reopened to traffic at about 5:20 a.m.

All but one lane were reopened on the westbound side of the freeway by 6 a.m. That one lane was expected to remain closed for about 6 hours while crews cleaned up.

There was no word on what may have caused the big rig to crash.