CORONA — Aircraft and ground crews are battling an 800-acre wildfire in the dry, brown hills in western Riverside County.
Flames burned near homes protected by cleared ground but firefighters had the blaze 10 percent contained Thursday afternoon.
Even though there were no immediate threats to structures, the county Fire Department urged residents to be prepared in case an evacuation was needed.
Fire officials say mowing and brush clearing equipment caused the fire east of Corona, about 45 miles southeast of Los Angeles.
Helicopters made water-dropping runs as tankers painted red stripes of retardant across the fire's path.
Winds were light and temperatures peaked at 82 degrees, with a relative humidity of 21 percent.
Copyright 2010 The Associated Press.