LAKEPORT, Calif. (AP) — The U.S. Forest Service says the largest wildfire in California history is now 100 percent contained.

The service said Wednesday the Mendocino Complex — twin fires that erupted in July in Lake County — scorched 720 square miles (1,865 square kilometers) of brush and timber north of San Francisco, destroyed 157 homes and killed a firefighter.

READ MORE: Passenger Sets Himself On Fire Aboard eBART Train at Antioch Station

Officials says more than 400 firefighters remain in the area, doing repair work to prevent erosion and monitoring spots that continue to burn.

The blazes prompted the evacuation of thousands of people in Mendocino, Lake, Colusa and Glenn counties.

READ MORE: San Francisco Marina District Residents Fed Up With Brazen Crime Spree Hire Private Security

The smaller blaze was fully contained on August 14 but a massive blaze continued to burn in the Mendocino National Forest.

Authorities are still investigating what ignited the blazes.

MORE NEWS: Facebook Paying $4.75M Fine, $9.5M To Victims To Settle DOJ Discrimination Lawsuit

© Copyright 2018 The Associated Press. All Rights Reserved. This material may not be published, broadcast, rewritten or redistributed.