CAMP PENDLETON — A brush fire at Camp Pendleton exploded into what officials initially said was 1,000 acres Wednesday, prompting mandatory evacuations, officials at the Marine Corps base said on their Facebook page. The fire is east of the 33 Area, base officials said. Mandatory evacuations have been ordered for 25 Area, 26 Area, and 27 Area. The 25 Area includes Lake O’Neill Campground, and the Wounded Warrior Battalion. The evacuation center is at Paige Fieldhouse. Advertisement Initially, base officials said the fire was at 1,000 acres. An hour later officials said they do not know the size of the fire. The North County Fire Protection District, located east of the base in the Fallbrook area, tweeted that there is no threat to its district.