A major fire spanning more than 500 acres along Cajon Pass, Calif. has led to evacuation orders, closed down the Interstate 15 and created long delays for motorists who may want to head to Las Vegas, Nev. over the Labor Day weekend.

Evacuations have been ordered for parts of the nearby community of Oak Hills.

Two helicopters were dropping fire retardant on homes, the Daily Press reported. A reported 10 engines, 15 aircraft and a bulldozer were fighting the blaze, as firefighters fought to protect ranch homes in Oak Hills.

San Bernardino National Forest spokeswoman Carol Underhill said mandatory evacuations were in effect for residents in the triangular area south of Mesquite Road, east of Baldy Mesa Road and west of Interstate 15.

An evacuation center has been set up at the San Bernardino County Fairgrounds on Seventh Street in Victorville.

The fire broke out around 1 p.m., grew to 250 acres in a little more than an hour, and double in a little more than two hours.

U.S. Forest Service spokesman John Miller told the Daily Press that the fire started along the freeway center divider and jumped into the San Bernardino National Forest.

Structures are being threatened, Bob Poole, spokesman for the U.S. Forest Service, told the Los Angeles Times.

Watch the video of the massive fire below:

Watch a short video of the bumper-to-bumper traffic below: