The wildfire in the Angeles National Forest started about 2:15 p.m. About 300 firefighters and several air tankers and choppers are being used. Guests at a campground have been evacuated.Firefighters late Sunday were continuing to battle a blaze in the Angeles National Forest that had scorched more than 3,600 acres and forced the evacuation of campgrounds known to draw up to 12,000 visitors on Labor Day weekend.