UPDATE: As of Tuesday, Cal Fire reported the Roadrunner Fire to be 90 percent contained at 2,289 acres.
Firefighters on Monday were battling a grass fire that had consumed 1,500 acres near Porterville off Road 268 and East Teapot Dome Avenue, Cal Fire reported.
The Roadrunner Fire began about 4:30 p.m. Sunday and as of 9:15 a.m. Monday was 35 percent contained.
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The cause of the fire is under investigation.