LUCERNE VALLEY — A fast-moving fire in Lucerne Valley prompted mandatory evacuation orders and the closure of a stretch of Highway 18 on Sunday afternoon.

Dubbed the High Fire, the blaze, which was reported just before 4 p.m., spread quickly, forcing authorities to order evacuations for residents living south of Highway 18 and east of High Road, according to CALFIRE San Bernardino officials.

Estimated at 100 acres with a rapid rate of speed and 20 percent containment as of 7:15 p.m., the fire forced the closure of Highway 18 between Joshua Road and Willow Wells Avenue Caltrans District 8 officials announced in a tweet.

CALFIRE officials reported that the evacuation area, which is south of Highway 18, stretched from High Road to the west to Buena Vista Road east, and from Sutter Road to the north to Santa Rosa Road to the south.

CALFIRE San Bernardino and the San Bernardino County Fire Department are in a unified command battling the blaze, with assistance from the San Bernardino National Forest Service, and are utilizing air and ground attacks.