Ukrainian army positions came under 58 attacks on Sunday, the press center of the anti-terrorist operation staff said in a report.Most attacks, 35, were conducted in the Mariupol sector. Twenty-one violations of the truce occurred in the Donetsk sector. Avdiyivka and Novoselivka Druha The Ukrainian army engaged in a shootout with a group of militants in Avdiyivka.Two attacks on Ukrainian army positions by use of grenade launchers and small arms were observed near the populated locality of Orikhove in the Luhansk sector.