For the latest news on the wildfires, please read this story.

SANTA ROSA, Calif. — Fast-moving wildfires raged across Northern California on Monday, killing at least 10 people, sending well over 100 to hospitals, forcing up to 20,000 to evacuate and destroying more than 1,500 buildings in one of the most destructive fire emergencies in the state’s history.

Firefighters were battling blazes in eight counties, officials said.

In Santa Rosa, the fire gutted a Hilton hotel and flattened the Journey’s End retirement community, a trailer park not far from the freeway that crosses the city. Most of the trailers were leveled, leaving a smoldering debris field of household appliances, filing cabinets and the charred personal effects of more than 100 residents. Pieces of ash fell like snowflakes, and a pall of white smoke across the city blotted out the sun.

Janet Upton, a deputy director of the California Department of Forestry and Fire Protection, said that at least 15 separate fires across the region had destroyed more than 1,500 homes and businesses and burned about 94,000 acres since late Sunday night. At least 10 people had been killed as of Monday evening, she said: seven in Sonoma County, two in Napa County and one in Mendocino County.