A fast-moving wildfire exploded to roughly 10,200 acres near the Los Angeles County community of Castaic Wednesday morning, prompting mandatory evacuation orders and road closures, authorities said.

As the sun began to set over Castaic Lake on Wednesday, the hills to the north and east were engulfed in flames, casting an eerie orange glow across the valley below.

A hard-charging brush fire erupted in northern Los Angeles County on Wednesday, hustling through 9,400 acres of terrain so far, aided by heavy, dry brush and pushed by gusting Santa Ana winds, Cal Fire officials said.