The so-called Thomas fire is only 15 per cent contained, now threatening the city of Santa Barbara and the nearby coastal town of Carpinteria, and is on track to become one of the worst wildfires in California history. It has already destroyed 583 structures and scorched 155,000 acres (60,000 hectares), the authorities say.
A photo posted by Santa Barbara police this morning showed a wall of flames several yards (meters) high very close to buildings in Carpinteria.
Conditions remained very dry in southern California, according to the National Weather Service, but strong winds that have fuelled the fires for much of the week have eased significantly.
At least five other blazes in southern California are now largely contained, the state agency Calfire said.
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After a five-day siege, some Californians were finally able to return home to inspect the damage wrought by the wildfires, which together have forced hundreds of thousands of people to flee and destroyed more than 850 structures, including multimillion-dollar mansions.
US President Donald Trump has issued a state of emergency for California, authorising the release of federal funds.
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