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.

Officials released details about the recovery effort from the initial Los Angeles fires — expected to last up to 18 months as authorities clear the wreckage.

As the Los Angeles area begins the formidable task of rebuilding after the most destructive wildfires in its history, the city's artists and art collectors are mourning what could amount to billions of dollars in irreplaceable art that went up in flames.