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Matt Hartman, Associated Press
A burned-out car lies next to a destroyed structure in the rural community of Baldy Mesa, Calif. on Saturday, July 18, 2015. The North Fire stuck Friday near Interstate 15 in the Cajon Pass in San Bernardino County, Calif. The 5.5-square-mile fire destroyed 20 vehicles on the freeway before burning three homes and 44 more vehicles in the community of Baldy Mesa.

LOS ANGELES — A rare summer storm allowed firefighters to contain 60 percent of a wildfire that swept across a California interstate, torching vehicles and sending people running for their lives.

Light rain and moist air dampened the blaze in the mountainous Cajon Pass 55 miles northeast of Los Angeles, the main artery between Southern California and Las Vegas.

The wind-driven fire was sparked Friday afternoon below the elevated lanes of Interstate 15. Pushed by 40 mph winds, it raced up a hill and onto the traffic-clogged freeway, trapping hundreds of people amid a cauldron of smoke, flames and ash.

The flames destroyed 20 vehicles on the freeway before heading into the neighboring community of Baldy Mesa, where it burned seven homes and destroyed 44 more vehicles.

In all, the fire burned about 8 ½ square miles.

Amazingly, only two people were injured. Both suffered minor smoke inhalation, authorities said, but they declined medical attention.

California is in the midst of severe drought, and wildfires are common. Some break out near freeways, but it's very unusual to have vehicles caught in the flames.

It being a Friday afternoon, however, Interstate 15 was typically jammed with vehicles traveling between Los Angeles and Las Vegas. Adding to the congestion was construction work in the area.

Another wildfire that broke out Friday night in the San Gabriel Mountains and forced the evacuation of 300 campers in nearby Wrightwood is 35 percent contained after burning about 200 acres.