The fire department in Ventura County, north-west of Los Angeles, labelled the blaze "very dangerous." Residents should heed evacuation orders, said Sheriff Jim Fryhoff at a press conference on Wednesday afternoon.
Within a few hours, the so-called "Mountain Fire" near the city of Camarillo had spread over an area of more than 40 square kilometres.
Authorities warned of strong Santa Ana winds, which mainly occur in Southern California during the autumn and winter. The dry winds, they said, would intensify the extreme fire risk. Additionally, persistent summer-like temperatures and dry vegetation, which easily ignites, are contributing factors.
California Governor Gavin Newsom has requested emergency aid from the Federal Emergency Management Agency to combat the fire. Over 3,500 homes and businesses are at risk in the affected region, according to a statement.
The extent of the damage was not immediately known. Two residents were taken to hospitals due to possible smoke inhalation. Thick smoke covered the region, with images showing charred cars and burning houses.
California's fire season ends at the end of the year, the state's fire authority noted on social media platform X.
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