More than 50,000 people were under evacuation orders or warnings Wednesday as a huge and fast-moving wildfire swept through rugged mountains north of Los Angeles, but fire officials said a rapid ground and air assault was giving them the upper hand.

A fast-moving California fire has forced authorities to evacuate part of a 5,000-person jail in Los Angeles County. The Hughes Fire, which broke out Wednesday afternoon in Castaic, is 0 percent contained and has already burned nearly 9,300 acres, according to Cal Fire.