Militants have conducted 42 attacks on Ukrainian army positions over the past day, the anti-terrorist operation staff's press center wrote on Facebook on April 26.Militants fired 82mm mortars near Avdiyivka, Vodiane, Taramchuk, Novotoshkivske, Krasnohorivka and Novomykhailivka, and used 120mm mortars near Novotroitske.Most shelling instances by use of various types of grenade launchers, machineguns and small arms were observed in Maryinka, the press center said.The Ukrainian army returned fire 13 times, it said.