CRESTLINE (CBS) — Roughly 400 firefighters are enduring high winds and rough terrain as they continue battling a five-acre brush fire in San Bernardino County.

The fire, which is burning near Highway 18 below Crestline, was started by a single-car crash at 11:30 p.m. Thursday.

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The blaze forced officials to close Highway 18 from State Route 138 to 40th Street in San Bernardino.

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Firefighters are concerned the fire could grow to 1,000 acres due to high winds and dry vegetation.

“It’s unusual for January, usually we have a lot of moisture on the ground,” one firefighter told CBS2’s Kirk Hawkins.

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The fire is not burning near any homes, but one firefighter suffered an ankle injury due to the steep terrain.