Update: 4:10 a.m. 

KCFD has fully contained the fire. The fire burned at least 200 acres. No homes were threatened. 

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Kern County fire crews are responding to a grass fire that broke out just before 8:30 p.m. Sunday evening north of Oildale.

The fire broke out in the area of Round Mountain Road and Granite Mountain Road.

KCFD says the fire burned about 150 acres and is only 60 percent contained. 

The cause of the fire is under investigation.