“Law enforcement is going door-to-door with mandatory evacuation for Desert Front Road and Wild Horse Canyon,” the latest fire report said. “Wrightwood is under evacuation warning. There is a roadblock from Hwy 138 to Lone Pine (Highway 2),” according to the incident review. CNN has contacted authorities for details on how many residents are under evacuation orders. The fire started on Saturday afternoon. The cause remains under investigation. Located about 23 miles outside of the Los Angeles area, the forest is located “in one of the driest, most fire-prone areas in the United States,” according to the Los Angeles National Park. Firefighters in Southern California have already warned of a difficult fire season. Robert Garcia, head of the U.S. National Park Service’s fire department, told CNN last week that the summer months have begun to “worry.” Firefighters have been mobilized since March in Arizona and New Mexico, where the Black Fire became the state’s second-largest wildfire in history. “Southern California typically has a period of fire historically in late June and then in the fall,” said Chief Garcia. “But we see activity now all year round.” The Angeles National Park is already under fire restrictions that are expected to spread around the forest in the coming months, he said. CNN’s Stephanie Elam contributed to this report.