A man has been arrested on suspicion of arson over a wildfire in Northern California that has destroyed more than 175 homes and businesses and forced hundreds of residents to flee, officials say.
The conflagration is one of two dozen major wildfires across the drought-parched US West that have all together charred nearly 120,000 hectares of land.
Damin Pashilk, 40, was arrested on Monday and faces 17 counts of arson over the so-called Clayton Fire, in the foothill community of Lower Lake, and other fires nearby over the past year, the California Department of Forestry and Fire Protection (Cal Fire) said.
"Mr. Pashilk committed a horrific crime and we will seek prosecution to the fullest extent of the law," Cal Fire Chief Ken Pimlott said in a statement.
The fire, burning some 130km north of San Francisco, was driven by fierce winds after sparking on Saturday evening. It threatens 1500 structures in addition to the 175 destroyed, Cal Fire said on Monday.
The Clayton fire, which had blackened about 1600 hectares by late Monday afternoon, was about 5 per cent contained, fire officials said.
More than 1600 firefighters were battling the flames, Cal Fire spokesman Daniel Berlant said, adding that receding winds on Sunday evening had allowed crews to make progress cutting containment lines around the flames and putting out hot spots.
The nearby community of Clear Lake was evacuated, and sheriff's deputies in Lake County were investigating burned-out structures.
On Monday afternoon, California Governor Jerry Brown, a Democrat, declared states of emergency for the Clayton fire and another in San Luis Obispo County, the so-called Chimney fire, allowing local officials to get help from emergency response agencies statewide.
The Chimney fire was just 10 per cent contained by Monday evening. It had scorched more than 2185 hectares within less than 48 hours after erupting on Saturday afternoon, destroying a dozen structures and threatening about 200 more, with hundreds of residents being told to evacuate.
One of the season's largest fires so far, the Soberanes blaze, was 60 per cent contained by Monday. It burned through more than 30,189 hectares near scenic Big Sur, destroying 57 homes after it began on July 22.
A bulldozer operator died on July 26 when his tractor rolled over as he helped property owners battle the flames, this year's sixth wildfire fatality in California.
Authorities have traced the Soberanes fire to an illegal campfire left unattended in a state park.
