Military personnel and aircraft are helping to extinguish the fire in the Rila National Park, the Ministry of Defense announced.
An Air Force crew with a Mi-17 helicopter is helping to extinguish the fire today.
The helicopter took off at 11:45 a.m. from the Krumovo air base.
20 military personnel with equipment from the Third Brigade Command - Blagoevgrad, part of the Land Forces, joined the firefighters today.
The involvement of the military personnel follows a request from the General Directorate of Fire Safety and Population Protection and by order of the chief of defense, the Ministry of Defense specified.
The fire started yesterday evening over the village of Gorno Osenovo, Simitli municipality, at an altitude of about 1,700 meters.
In July, the largest and most difficult to extinguish fire raged in Rila.