CASTAIC (CBSLA) – A big rig overturned Wednesday night in the northbound lanes of the 5 Freeway in Castaic, prompting authorities to close the northbound side of the freeway until at least 2 a.m.

The accident occurred just after 10 p.m. just north of Parker Road and traffic was being taken off the freeway at Parker Road, according to the California Highway Patrol.

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The big rig was laying across all lanes of the northbound portion of the freeway. Sky2 was over the scene, where traffic was backed up for miles.

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At least one injury was reported, but the extent of the injury was unclear.

The cause of the accident was under investigation.

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