People watch flames as night falls during the Holy Fire near Corona, California. Brushy, drylands in California between Orange and Riverside counties continue to burn, leading to more than 20,000 evacuations from a fire blamed on arson. The Holy Fire has scorched more than 21,473 acres after it ignited in the Cleveland National Forest's Holy Jim Canyon. Thick smoke and ash spewing from the fire prompted air quality warnings. As in many of the wildfires burning across the state, steep terrain in the Holy Fire is making it difficult for fire crews and engines to get close to the flames.