Forty people have died and hundreds are still missing in California after six days of wildfires that have devastated swathes of countryside and destroyed thousands of homes.
California's governor said it was "one of the greatest tragedies" the state had ever faced.
More than 10,000 firefighters are battling 16 remaining blazes.
Winds of up to 70 km/h (45mph) brought them to new towns, forcing many more people to evacuate.
One of the worst-affected areas is the city of Santa Rosa, in the Sonoma wine region, where 3,000 people were evacuated on Saturday.
"The devastation is just unbelievable," Governor Jerry Brown said on a visit to the city.
"It is a horror that no one could have imagined."
It is the most lethal outbreak of wildfires in the state's history. More than 100,000 people have been displaced. and whole neighbourhoods have been reduced to ash.
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The prisoners fighting wildfires in California
Firefighters had made some headway on Friday, clearing dry vegetation and other combustible fuel around populated areas on the fires' southern flank.
But the return of strong winds combined with high temperatures and dry air spread the fires further.
