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L.A. County firefighters battled multiple hot spots east of the 5 Freeway. No injuries were reported.
A California Highway Patrol unit escorted northbound vehicles through the area just north of Templin Highway, north of Castaic, south of the Grapevine, where a closure had been in effect from about 5 p.m. to 6 p.m.
A northbound I-5 closure at Parker Road remained in effect until about 7 p.m.
The fire was reported at 4:49 p.m.
Arson is suspected in the fires, according to authorities. Police and firefighters say they have suspect descriptions of people who were in the area earlier. There is also a vehicle description. Fires apparently were set in different locations.
Two men with long hair were spotted leaving the area in a green sedan around the time the fires began.