A wildfire in mountains east of Los Angeles that has forced thousands of people from their homes was sparked by a malfunctioning diesel vehicle, fire officials said Monday.

The vehicle spewed burning carbon from its exhaust system, igniting several fires Friday on Oak Glen Road in Cherry Valley, and authorities were asking anyone who may have seen such a vehicle at the time to contact investigators, according to a statement from the California Department of Forestry and Fire Protection.

The blaze in Riverside County, among several wildfires across California, had consumed nearly 42 square miles of dry brush and chaparral since it broke out Friday evening, fire officials said.

As of Monday night, it was just 7% contained and the fire along with coronavirus precautions made for added stress at an evacuation center, said John Medina, an American Red Cross spokesman.

Volunteers used to “close contact” with evacuees have had to adjust their approach during a time of social distancing, Medina said.

“I mean, that’s part of the recovery of a disaster, is that you have to show warmth and love and caring. And that’s hard when you’re standing 6 feet away. So that’s the biggest challenge,” Medina told KESQ-TV.

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