The so-called Tumbleweed Fire was reported shortly before 2 p.m. near Gorman Post Road and the southbound side of the freeway, according to the Los Angeles County Sheriff's Department. Authorities said flames were being driven by winds in the area - which, according to the National Weather Service, are gusting between 18 and 25 mph.
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The blaze was initially reported at 200 acres, but quickly grew in size. It is 10% contained.
No structural damage was immediately reported, but two firefighters suffered minor injuries, authorities said.
Evacuations were under way for the Gorman Park Area in Gorman, the Sheriff's Department said.
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The cause of the fire was unknown.