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A 300-acre brush fire in the Fairmont area of the Antelope Valley prompted the closure of Highway 138 Thursday morning.

The Weeville Fire started near Highway 138 and 210th Street West, with light to medium grass burning in the area.

The blaze was first reported at 50 acres but soon grew to 300. More than 250 firefighters, three fixed-wing aircraft and multiple water-dropping helicopters were working to stop the spread of the blaze, according to the Fire Department.

Winds are blowing about 30 to 40 mph in the vicinity of the blaze, according to the National Weather Service. Later, fire officials indicated gusts reached 50 mph.

Aerial video from Sky5 showed white smoke being pushed by winds but no flames as a helicopter was making water drops in the area.

The California Highway Patrol closed Highway 138 at the Gorman post amid the fire response.

No injuries were reported and no structures were threatened.