No casualties were reported but the blaze threatened 5,420 homes and other structures in communities about 40 miles (65 km) north of downtown Los Angeles where residents have been told to prepare for possible evacuations over the weekend, Garrido said.
Across the United States, fires have been less ferocious so far in 2020, burning around 1.4 million fewer acres than in the same period of 2019. Conditions are expected to worsen in California next month when Santa Ana winds arrive in the south and El Diablo winds pick up in the North.