Firefighters stand near flames as they set a backfire at the wildfire in the Los Angeles National Forest, north of Glendora, California, on Sept. 4, 2012. The wildfire has burned 3,634 acres in the Los Angeles National Forest and was about 24 percent contained since the fire broke out in San Gabriel Canyon Sunday. The blaze was not expected to be fully contained until Sept. 13, 2012. [Xinhua]