With high winds driving the flames, a fast-moving wildfire exploded to roughly 10,200 acres near the Los Angeles County community of Castaic Wednesday, prompting mandatory evacuation orders for tens of thousands of people.

A fast-moving brush fire erupted in Los Angeles County on Wednesday morning, quickly racing across 1,000 acres of terrain, aided by heavy, dry fuels and pushed by gusting Santa Ana winds.

Firefighters fought to maintain the upper hand on a huge and rapidly moving wildfire that swept through rugged mountains north of Los Angeles and resulted in more than 50,000 people being put under evacuation orders or warnings.