The fire erupted Sunday in the Lower Kern River Canyon and burned up and out of the canyon in a portion of Sequoia National Forest southwest of Lake Isabella, a popular fishing, boating and hiking area about 110 miles north of downtown Los Angeles.
Driven by wind and topography, the fire was burning in grass, brush and trees. Fire officials said areas of timber were torching in groups and there was a high rate of spread and spotting.
More than 1,000 firefighters were on the lines or in strike teams with engines poised for structure protection.
Fourteen air tankers and 13 helicopters were aiding the fight.
Authorities have said the fire was human-caused but have not determined whether it was an accident or intentional.
Thill said firefighting costs had reached $2.5 million.
It's the second major fire in the region this summer. The Bull Fire burned more than 16,000 acres north of Lake Isabella in July and August, destroying eight homes and six outbuildings.
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