Crews and aircraft are working to contain a wildfire of less than 1 square mile in a mountain canyon about 25 miles west of the Las Vegas Strip.
U.S. Forest Service spokesman Ray Johnson said Monday the fire quickly grew to more than 200 acres Sunday in Lovell Canyon, but air tankers using water and fire retardant helped slow the spread of flames.
No injuries are reported and no structures are threatened.
Johnson says the fire is about 20 percent contained, and 150 firefighters are now at the scene about 4 miles off State Route 160.
Johnson says the hamlet of Mountain Springs, about 5 miles away, and Torino Ranch summer camp about 7 miles away aren't threatened.
Johnson says foliage is exceptionally dry, and the fire may be human-caused.
He says it's being investigated.