A wildfire that quickly grew to 200 acres near the base of the Cajon Pass and prompted mandatory evacuations was 40 percent contained Wednesday, a day after it broke out.
The Sierra Fire broke just before 4 p.m. Tuesday in the Sycamore Flats area along the 15 Freeway (map), authorities had said. It was burning in the San Bernardino National Forest.
The blaze was burning in steep, rugged terrain, consuming dry chaparral, according to the interagency site InciWeb.
Water-dropping helicopters and air tankers dropping retardant slowed the spread of the fire and prevented it from reaching homes along Glen Helen Road, according to the U.S. Forest Service.
At peak, about 400 firefighters were on scene, along with five helicopters and six air tankers, the Forest Service reported.
On Wednesday, firefighters were continuing to work on building lines around the fire. Gusty winds forecast for the rest of the week were causing concern, according to the Forest Service.
Full containment is expected Friday.
An evacuation center was set up at the Jessie Turner Center, 15556 Summit Ave. in Fontana. Animals may be taken to the Devore Animal Shelter, 19777 Shelter Way in San Bernardino.