Lanes in both directions of the 5 Freeway in Castaic reopened after smoke from a fast-spreading fire forced closures at Lake Hughes Road, the California Highway Patrol said.
The 32-acre brush fire, which burned along the freeway, was reported at 2:38 p.m. Saturday near the lower crossover, according to the CHP.
The blaze was fully contained about three hours later, according to the Los Angeles County Fire Department.
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More than 100 firefighters battled the blaze from the ground and air.