Angeles National Forest officials said the Fork Fire was located off of Highway 39 and East Fork Road.
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Hundreds of recreational visitors were evacuated as crews battled the nearby flames.
High temperatures and dry brush helped feed the fire, according to fire officials.
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An injured firefighter had to be airlifted to safety after he was hurt by falling rocks while battling the blaze, according to L.A. County sheriff's officials.
Highway 39 was closed 2 miles above Sierra Madre Boulevard during the firefight.
As Sunday night, forest officials said the blaze was 0 percent contained.