Thousands of firefighters battled blazes in northern and southern California on Tuesday as body recovery teams searched the remains of houses and charred cars for victims of the deadliest wildfire in the history of the US state.

At least 50 deaths have been reported statewide so far from the late-season wildfires, and with hundreds of people unaccounted for, the toll is likely to rise.

Most of the fatalities have been caused by the so-called "Camp Fire" in and around the town of Paradise, population 26,000, in the foothills of the Sierra Nevada mountains about 80 miles (130 kilometers) north of the capital Sacramento.

"Today an additional six human remains were recovered, which brings the total to 48. All six of those remains were located in Paradise, and they were located within homes," Sheriff Kory Honea told a news conference.

Another two deaths have been reported from the "Woolsey Fire," north of Los Angeles.

Others escaped by driving through tunnels of smoke and fire as flames licked at their vehicles on gridlocked roads dotted with abandoned cars.

The "Camp Fire" has destroyed some 7,600 homes and 260 commercial properties. Battling the blaze are more than 5,600 fire personnel, some from as far away as Washington state and Texas.

The "Woolsey Fire," which also began on Thursday, has razed 97,114 acres (39,300 hectares) and has been 40 percent contained.