CASTAIC, Calif. (AP) — 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.

Palisades Fire initially started 10:30 a.m. Jan. 7 in Los Angeles County. It has burned 23,448 acres after being active for 16 days. A crew of 3,274 firefighters has been working on site and they managed to contain 72% of the fire by Thursday morning. The blaze's cause remains under investigation.

Firefighters are responding to a brush fire in the Castaic area of Los Angeles County Wednesday morning, according to the Angeles National Forest.

Firefighters in Southern California are once again battling a wildfire, this time in Castaic in Los Angeles County, north of Los Angeles itself. Evacuation orders have been issued for the surrounding areas.

Spencer Pratt and Heidi Montag are suing the city of Los Angeles and the Department of Water and Power, alleging that the agencies' management of the water supply directly caused damage to their home in the Pacific Palisades Fire.