A fire burning in the in the San Bernardino National Forest isn't posing any threats to homes but the steep terrain is challenging firefighters.
U.S. Forest Service spokesman Bill Peters says the 100-acre fire is 10 percent contained Wednesday and 480 firefighters and several helicopters are at the scene near Lake Silverwood. Two planes are also on standby.
Peters says the fire poses no threat to residents, all highways are open and there is no active flame front.
The fire started about 5 p.m. Tuesday south of Hesperia and north of Crestline, some 80 miles northeast of Los Angeles.
Peters says the fire started around the time several thunderstorms passed through the area.
Copyright 2010 The Associated Press.