Officials say the wildfire burning in Southern California's Angeles National Forest won't be fully contained until Sept. 19.

The previous containment date was Sept. 15.

U.S. Forest Service spokesman Tom Debellis says crews Sunday are watching for flare-ups along the 120-mile perimeter of the massive fire north of Los Angeles, which has burned more than 250 square miles. The arson-caused blaze is 84 percent contained.

Debellis says more firefighters are being sent home every day. There were 1,519 men and women working the blaze Sunday.