Fanned by winds of over 50 miles (80 kilometers) an hour, the blazes have forced more than 20,000 people to evacuate in the country’s heaviest populated state since they began Sunday night.
California’s fire service said about 73,000 acres (30,000 hectares) have been ravaged by the major infernos.
“The Sheriff’s Office confirms seven fire-related deaths from the Sonoma Co. fires. Our condolences to their friends and families,” tweeted the sheriff of Sonoma County in the state’s north. The previous toll had stood at three.
At least 1,500 buildings were destroyed as the state declared an emergency in three counties ravaged by intense fires, mostly in its famous wine-producing regions.
Fourteen major fires are burning in total. Napa, Sonoma and Yuba counties are covered by Governor Jerry Brown’s order. The counties are north of San Francisco Bay.
An AFP correspondent in the Santa Rosa area witnessed multiple explosions from gas lines or gas tanks, in addition to charred out homes and a winery. Fire trucks were out in force in that area, he said.
About 410 firefighters are working on blazes in Mendocino, a sheriff’s spokesman in that county told the CBS news network, adding that multiple fatalities were expected.
– Significant damage –
Another fire in Anaheim has surged to char 800 hectares and at least 200firefighters scrambled to try to contain it. Dozens of shelters were opened in schools and churches. Even livestock had shelter areas set up on some fair grounds.
“We’re going to have to start over completely,” Dreama Goldberg, who fled her home — now a heap of ashes — at eight months pregnant, told NBC.
Jesus Torres told CBS he barely had time to grab a few things and run from his home.
“We could see the sky was getting red: we did not know it was fire until the last second because there was just smoke everywhere,” he said.
The Hilton Hotel in Santa Rosa said on Facebook that its staff and guests were evacuated safely.
“The wildfires in Santa Rosa, California and the surrounding areas have forced the evacuation and temporary closure of Hilton Sonoma Wine Country,” it said on Facebook.
“All guests and associates of the Hotel have been safely evacuated and are not able to return until further notice. It is anticipated that the Hotel has sustained significant damage.”
Pacific Gas & Electric said more than 196,000 customers had initially lost elecricity although half had had their power restored.
“As of 3.00 pm (2200 GMT), we have about 99,000 customers out of power throughout our service area, with the majority of them in Sonoma and Napa counties,” it said.
Get more stories like this on Twitter & Facebook