A “fully involved” big rig fire has been reported on the 5 Freeway north of Castaic Wednesday afternoon, officials said.

The fire was reported at about 3:40 p.m. Wednesday near the northbound 5 Freeway south of Templin Highway, according to Franklin Lopez with the Los Angeles County Fire Department.

“It is a fully involved tractor, with no spread to brush,” Lopez said.

Roof shingles are possibly in the truck trailer, according to California Highway Patrol logs.

The No. 3 and 4 lanes of the 5 Freeway are closed for an unknown duration near the CHP turnaround south of Templin Highway, according to the CHP.

Ed. Note: This is a breaking news story, more information will be added as it becomes available.

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