The ATO Headquarters says the forces of the antiterrorist operation intends to fire back if militants continue shelling after 04.30 p.m. on Monday. The press center of the ATO Headquarters announced this on Facebook, Ukrainian News Agency reports. "The ATO Headquarters warns that the forces of the antiterrorist operation will be forced to fire back in case of continuation of shelling of the Ukrainian positions after 16.30 to avoid losses among the personnel," reads the statement. The press center of the ATO Headquarters notes that militants use 122-mm artillery, tanks, 120-mm and 82-mm mine throwers to shell the positions of the Ukrainian army outside Donetsk and Mariupol. As Ukrainian News Agency earlier reported, militants shelled the positions of the forces of the antiterrorist operation 67 times on 12 February 2017.