A fast-moving wildfire exploded to more than 9,200 acres near the Los Angeles County community of Castaic Wednesday morning, prompting mandatory evacuation orders and road closures, authorities said.

Continued strong winds and dry conditions on Wednesday morning rapidly spread a fire near Castaic Lake in northern Los Angeles County and has burned through 8,096 acres.

Firefighters responded to a brush fire Wednesday north of Los Angeles on a day of red flag warnings for parts of Southern California.