DE LUZ -- A fire that broke out Monday afternoon in the hills west of Temecula has now burned about 430 acres, but is 50 percent surrounded, according to Riverside County fire officials. No structures are currently threatened and fire officials say they expect to have the fire completely surrounded by 8 a.m. Wednesday.

About 700 firefighters are fighting the blaze, with a half-dozen airplanes and helicopters dropping water and retardent from the air on the steep hillsides and canyons. One inmate firefighter suffered an ankle injury and has been taken to a nearby hospital, but there have been no other injuries and no structures have burned in the remote area, officials report.

The fire started when a stolen car crashed into a rock and caught fire on Carancho Road, a winding canyon road. The occupants of the car were uninjured and fled, according to the California Highway Patrol.