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More than 2,800 homes were destroyed in Santa Rosa by the Tubbs Fire, which has killed 15 people in Sonoma County and is just one of several wildfires that continue to burn in the North Bay, city and county officials said at a briefing Thursday afternoon.

Santa Rosa Mayor Chris Coursey said that city staff have determined as of Thursday morning that 2,834 homes and more than 400,000 square feet of commercial space were lost in the blaze that tore through the city Sunday night and early Monday.

Coursey was one of several city, county, state and federal officials to speak at a 1 p.m. briefing at the Sonoma County Fairgrounds.

"The city of Santa Rosa has suffered a serious blow in these fires," he said, noting other major infrastructure was destroyed like the city's newest fire station, Station 5.

Sonoma County Rob Giordano said the county's death toll from the fires ticked up by one from earlier Thursday and is now at 15.

Giordano said there have been roughly 1,000 missing persons reports in the county but 603 of those have been confirmed as safe. He said some of the missing person reports might be duplicates so the missing persons total could be lower.

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Giordano also dispelled rumors that immigration status checks were taking place at evacuation shelters.

"No one involved in this process is going to ask any immigration questions," he said. "It's not appropriate, it's not going to happen ... help is there for everyone."

The Tubbs Fire, the most destructive to Sonoma County of the several North Bay fires, had burned 34,270 acres and was 10 percent contained as of midday Thursday.