California Governor Jerry Brown declared a state of emergency in eight counties -- including the wine-producing regions of Napa and Sonoma -- and said thousands of firefighters had been deployed to fight the blazes.
Seven deaths were reported in Sonoma County, three in Mendocino County, two in Napa County and one in Yuba County and the governor said "emergency responders anticipate the number of fatalities could grow."
Among the dead in Napa were a couple aged 99 and 100 years old who had been married for 75 years, KTVU-TV said. They were unable to evacuate their home in time.
About 25,000 people have been evacuated in Sonoma County and 5,000 have sought refuge in shelters, the department said.
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The fires have torched more than 115,000 acres and destroyed over 2,000 homes and businesses, according to the authorities.
The California Department of Forestry and Fire Protection (Cal Fire) said 17 large fires were continuing to burn today.
"The winds that fanned these fires Sunday night and Monday morning have decreased significantly, but local winds and dry conditions continue to pose a challenge," Cal Fire said.
Appealing yesterday to President Donald Trump for federal aid, Governor Brown said the "devastation and disruption caused by these fires is extraordinary.
"Thousands have been made homeless."
Maureen Fairchild, a nurse, was working at a hospital in Marin County where some of the evacuees were brought.
"I was working in a memory-impaired unit," Fairchild told AFP. "We had all these people who were already confused and now they were in an unfamiliar place with all this frenzy going on around them."
Kris Hammar, who lives in the city of Santa Rosa on the edge of a mandatory evacuation zone, had not yet evacuated but was monitoring maps, wind direction, and fire updates to see if she and her family should bolt.
"There were times at night when my street was like a freeway," Hammar said. "People evacuating were flying down my street.
"Then, the next day it was deserted.
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