A total of two soldiers from the Ukrainian army and one from the the Russian backed rebel forces were killed in the Sunday evening attack in northern Donetsk, according to Russian language news accounts.
According to a statement posted on the website of the Donetsk ministry of defense webpage the Ukrainians lost two killed in action and another five were wounded in the probe they launched.
Rebel media said that one soldier was killed in the operation.
The Ukrainian ministry of defense denied the operation even took place, and has said that the news of it originated in social media.
On Monday, Ukrainian said that five of their soldiers were wounded in Donetsk in ongoing shelling.
A report posted on the website of lb.ua said that the rebels fired artillery on Avdievka, Peski and Opytnoye from 1800 hrs to midnight. Rebels used 82mm and 120mm mortars and, according to the report, 16 rounds from a 122mm rocket artillery platform, a BM-21.
One Ukrainian soldier was wounded in Opynoye.
The news report also said that Ukrainian commanders in the area offered the rebels a ceasefire, to which they agreed. But the rebels subsequently violated the ceasefire.
A separate report from lb.ua said that rebel fire hit Avdievka and Zaitsevo Monday evening. Rebel commanders used mortars at first before switching to BMP-2 and small arms fire.
Another report said that rebel fire damaged nine buildings in Zaitsevo Monday afternoon, while intending to hit residential buildings. All the buildings damaged were agricultural or other non residential buildings.
Rebel mortar fire was reported at 0500 hrs Monday in Lugansk, around Troiskoye.
Rebel media said that Ukrainian artillery fire hit Gorlovka Monday afternoon, which is directly adjacent to Zaitsevo, causing nearby fields to burn.