At least 28 people are believed to be dead and more than a dozen others remain unaccounted for as multiple wildfires rage across Southern California.

The Hughes Fire grew rapidly near Castaic Lake, about 45 miles northwest of the city of Los Angeles, after it broke out at around 10.53am PST on Wednesday. No homes or businesses have been damaged, but about 31,000 residents have been forced to flee, officials said, with thousands more under evacuation warnings.