600 people are missing in wildfire that ruined Paradise

Drone footage of the destroyed town of Paradise in northern California

Drone footage of the destroyed town of Paradise in northern California

The number of people listed as missing in one of California's deadliest wildfires has skyrocketed past 600, authorities said Thursday, as the remains of seven additional victims were found by rescuers.

The revised list of 630 people whose whereabouts and fate remained unknown is more than double the 297 listed earlier in the day by the Butte County Sheriff's Office.

At least 56 people have been confirmed dead so far in the Camp Fire, which erupted a week ago in the drought-parched Sierra foothills 175 miles (280 km) north of San Francisco and now ranks as one of the most lethal single United States wildfires since the turn of the last century.

Two more people were killed during the Woolsey Fire, which also destroyed more than 400 structures and displaced about 200,000 people in the mountains and foothills near the Malibu coast west of Los Angeles.

The sheriff has asked relatives of the missing to submit DNA samples to hasten identification of the dead.

The California fire department (Cal Fire) said Thursday that the Camp Fire has destroyed 141,000 acres (56,655 hectares) and was 40 percent contained.

"This is so devastating that I don't really have the words to describe it", Brown told a press conference.

Pacific Gas & Electric, commonly referred to as PG&E, the utility company in Northern California, may be responsible for the Camp Fire that's now burning Northern California.