The deadly wildfires roaring through Los Angeles County entered a fourth day on Friday. At least 10 people have been killed, about 150,000 are under mandatory evacuation orders and more than 10,000 homes and other structures have been destroyed, according to local officials.

State prisoners have long been a part of California's firefighting force. Hundreds of them now are deployed in Los Angeles County.

Two massive wildfires menacing Los Angeles from the east and west were still burning uncontained on Thursday, but a brief respite from the fierce winds that have fanned the flames for two days allowed crews to slow their explosive spread.