The number of people killed in California has risen to 31, making it the deadliest wildfire in the state’s history, US authorities have said.

An additional 228 people remain unaccounted for. Butte County Sheriff Cory Honea said human remains recovered on Sunday included five bodies found at homes and one in a vehicle in the northern town of Paradise.

Butte County Sheriff Cory Honea said human remains recovered on Sunday included five bodies found at homes and one in a vehicle in the northern town of Paradise.

Former president Barack Obama said he and wife Michelle were “heartbroken” as he urged people to do what they can to help.

California governor Jerry Brown is requesting a “major disaster declaration” from President Donald Trump for the wildfires burning at both ends of the state.

US authorities say more than 8,000 firefighters are battling three large wildfires in California that have destroyed thousands of structures.

Roughly 397 square miles of the state is burning, with the the blaze known as the Camp Fire in Butte County being the largest.

The Woolsey Fire in Southern California has hit Malibu – which is popular with celebrities – as well as the city of Thousand Oaks, which was the site of a deadly shooting at a country music bar last week.

Weather conditions for the fires are ripe, with strong winds continuing through Sunday in Northern California and through Tuesday in Southern California.