An aggressive brush fire scorched its way across 50 acres of wildland in the remote Angeles National Forest Monday south of Llano, near the Valyermo area, prompting a massive response from federal, state and Los Angeles County fire crews.

Fire teams were first dispatched to the area of Big Pines Highway and Big Rock Creek Road at about 4:05 p.m., according to the Los Angeles County Fire Department.

The fire quickly blackened 50 acres in the dense forest, fanned by winds traveling at about 20 to 30 mph, according to the U.S. Forest Service.

Several Cal Fire tankers were called in to combat the blaze. Some structures, including a fire training camp on Big Rock Road, were threatened by the fire, which was being pushed in an eastern direction, generally toward the San Bernardino County community of Wrightwood.

There were no immediate reports of any injuries, and a cause of the fire was unknown.

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