Update 7:30 p.m.: Fire has burned 1,600 acres
Fire churned through the rugged San Gorgonio Wilderness in the San Bernardino Mountains on Monday as crews with water-dropping aircraft sought to surround the flames.
Nearly 1,000 firefighters battled the fire, which covered 2 1/2 square miles, or about 1,600 acres, and was 25 percent contained, officials say. No structures were threatened.
The fire broke out Sunday morning in Hathaway Canyon in the northern area of the Morongo Indian Reservation, about 85 miles east of Los Angeles.
Flames fed on chaparral and timber stricken by drought or bark beetles.
Nine air tankers, eight helicopters and 42 engines were among the resources deployed to the blaze.
The National Weather Service said a low-pressure system brought gusts to the San Bernardino Mountains, and a wind advisory was in effect until late Monday.
The cause is undetermined.
Update 8:38 a.m.: Fire burns 1,500 acres
A wildfire that was sparked near an Indian casino in Riverside County has burned at least 1,500 acres, according to the San Bernardino National Forest.
Fire officials say the Hathaway Fire is 15 percent contained. The wildfire began Sunday on the Morongo Indian Reservation and forest service officials say it has the potential to reach several thousand acres but it is burning in a wilderness area.
San Bernardino National Forest spokesman John Miller says no structures are threatened.
The fire was sending up a huge cloud of smoke that was blowing over mountains toward Big Bear and the Lucerne Valley.
About 400 firefighters were battling the blaze with the aide of 9 air tankers and 8 helicopters near the boundary of the Morongo Indian Reservation and San Gorgonio Wilderness.
Officials said the fire is burning in heavy chaparral and timber in a remote area with difficult access.