Santa Rosa, Calif. (Reuters): Wildfires fanned by strong winds swept through northern California’s wine country on Monday, killing at least 10 people, destroying hundreds of homes and businesses and forcing some 20,000 people to flee.

The deaths brought the official wildfire-related toll in California this year to 13, the greatest loss of civilian life from a single cluster of blazes in the state in a decade, state fire officials said.

Governor Jerry Brown declared a state of emergency for Napa, Sonoma and Yuba counties, encompassing some of the state’s prime wine-making areas, as the blazes raged unchecked and engulfed the region in thick, billowing smoke that drifted south into the San Francisco Bay area.

He later extended the declaration to include four more northern California counties and Orange County in Southern California , and requested a U.S. presidential disaster declaration to support state and local firefighting resources.

Sonoma County bore the brunt of the fatalities, with seven fire-related deaths confirmed there, according to the sheriff’s department. Two died in Napa County and one in Mendocino County, according to the California Department of Forestry and Fire Protection (CalFire).

Details of those deaths were not immediately available from state or local officials. But KGO-TV in San Francisco, citing unnamed California Highway Patrol sources, described one victim as a blind, elderly woman found in the driveway of her home in Santa Rosa, a town in Sonoma County.

The death toll could climb higher, said Brad Alexander, a spokesman for the governor’s Office of Emergency Services. More than 100 people were treated for fire-related injuries such as burns and smoke inhalation, CNN reported.

The toll marks a 10-year record for civilian wildfire fatalities in the state, dating back to 14 who lost their lives in a series of blazes that swept San Diego County and other parts of Southern California in October 2007, according to CalFire spokeswoman Janet Upton.

 

Ten people died in August 2008 in the Iron Alps Complex Fire in northern California’s Trinity County, including a crew of nine contract firefighters from Oregon killed in a helicopter crash.

On Monday, thousands of firefighters battled wind gusts in excess of 50 miles per hour (80 km/h) that have rapidly spread 15 separate wildfires across some 73,000 acres (114 sq miles) in northern California since erupting late Sunday night, according to CalFire spokesman Daniel Berlant.

About 1,500 homes and commercial buildings have been destroyed throughout the region, Ken Pimlott, director of CalFire, told reporters.

Two hospitals were forced to evacuate in Sonoma County, state officials said.