The death toll in California's wildfires has risen to seven as shaken survivors recounted the horror of watching fast-moving flames whip through neighbourhoods and devour their homes.
An army of firefighters from across the country struggled in California on Monday to control 17 large-scale blazes that have reduced expensive homes to smouldering piles of rubble and turned tens of thousands of acres into ashen wastelands.
"I've been a lifelong resident of this community, and I've never seen a fire with such destruction here in this area ever before," said Shasta County Supervisor Leonard Moty commenting on the Carr fire, one of the largest.
Alyce Macken said she had only minutes to flee her home in the town of Redding with her husband Ted as the flames swept closer.
"At six o'clock in the morning there was a knock on the door, a pounding, and it was the sheriff telling us that we had 15 minutes to get out," Macken told AFP. "We were out in 10 minutes. I was shaking, it just went by really fast."
Macken, who is retired, told AFP that she met other panic-stricken neighbours at a nearby shopping centre - and watched from afar as her home went up in flames.
"It was almost like a tornado with fire in it and it came over the hill and it wiped out our house, it wiped out our next door neighbour's home," she said.
Some 38,000 people have been evacuated in Shasta County due to the Carr fire, officials said.
A thick smoke haze covered a large segment of northern California, severely limiting visibility and contributing to breathing problems.
According to the California Governor's Office of Emergency Services (Cal OES), 12,000 firefighters from as far away as Florida and New Jersey have deployed across the state.
A firefighter identified as Brian Hughes died on Sunday while battling the Ferguson Fire, which is near Yosemite National Park.
Hughes "was struck and killed by a tree" while fighting the blaze, the Sequoia and Kings National Parks Service said. "We grieve his loss," they wrote on Twitter.
The remains of a person who ignored Carr fire evacuation orders was found in a burned out residence on Sunday, said Shasta County Sheriff Tom Bosenko.
Two firefighters were killed earlier battling the Carr blaze and three people - a 70-year-old woman and her two great-grandchildren aged four and five - perished when their Redding home was swallowed up by flames.
Firefighters and police are searching for seven people reported missing, Bosenko said.
He also said that 600 National Guard soldiers had been deployed to help in support duties such as roadblocks.
Donna and Billy Gill were forced to flee their Redding home and did not know when they would be allowed to return.
"Just the not knowing is probably the hardest part," Donna Gill told the Redding Searchlight newspaper. "This is just unbelievable. I don't know. You don't know what to say. We're all in it together, that's for sure."
Redding police chief Roger Moore warned that looting has become a problem since evacuations began.
California Governor Jerry Brown has declared a state of emergency in Shasta County, as well as in the counties of Lake, Napa and Mendocino.
US President Donald Trump earlier signed an emergency declaration to make federal aid available to county authorities.
