The death toll from a northern California wildfire has risen to five with the discovery of human remains believed to be those of a missing elderly woman and her two great-grandchildren, even as fire crews battled on to quell flames.
More than 38,000 people remained under evacuation orders on Sunday in and around the city of Redding, about 257km north of the state capital Sacramento, from a blaze that has destroyed more than 500 buildings and continued to rage largely unchecked into a seventh day.
The Carr Fire, the deadliest and most destructive of nearly 90 wildfires burning from Texas to Oregon, has charred almost 34,000 hectares of drought-parched vegetation since erupting last Monday.
More than 4,000 structures were threatened by the fire, officials said.
The weather on Sunday is expected to offer no relief for firefighters as it will hit more than 37.7C with low humidity and gusty winds, the National Weather Service said.
As of Saturday night, an army of some 3500 firefighting personnel and a squadron of 17 water-dropping helicopters had managed to carve buffer lines around just five per cent of the fire's perimeter.
Fire officials say the erratic behaviour of the blaze, stoked by high winds and triple-digit temperatures, has complicated efforts to contain the conflagration.
At the height of its fury on Thursday night, the fire was whipped into a storm-like frenzy by gale-force winds that drove flames across the Sacramento River into the western end of Redding, as thousands of residents fled for their lives in a chaotic evacuation.
The nearby town of Keswick, with a population of about 450, was reduced to cinders, and two firefighters were killed.
On Saturday, Redding police said they were searching for 17 people still unaccounted for two days afterward.
Shasta County Sheriff Tom Bosenko later confirmed the discovery of three bodies at a fire-ravaged home on the outskirts of Redding.
Bosenko said they had not yet been positively identified but were believed to be remains of three victims identified by relatives in news media reports as four-year-old James Roberts, his five-year-old sister Emily and their great-grandmother, Melody Bledsoe, 70.
The Los Angeles Times reported that Bledsoe's family said she desperately put a wet blanket over the children as their home burned.
The children's mother, Sherry Bledsoe, was quoted by the Sacramento Bee as saying, "My kids are deceased, that's all I can say," as she left the sheriff's office on Saturday.
So far this year, wildfires have scorched almost 1.7 million hectares across the US.
