According to the report, near Donetsk at 2135 the militants fired 120-mm mortars on the positions of the Ukrainian armed forces near the mine of Butivka and the village of Pisky.
The militants also fired small arms and rocket-propelled grenades on the village of Opytne.
In the area of Artemivsk, from 0320 the militants fired 120-mm mortars twice on the village of Troitske from the town of Stakhanov.
Russian-backed militants have been launching regular attacks on the village of Shyrokyne near Mariupol for several weeks in a row, the headquarters said.
"In the last 24 hours, almost from midnight to 0420 the militants fired 120-mm mortars," the report says.
According to the Minsk accords, weapons with calibers over 100mm are supposed to have been withdrawn at least 50 kilometers back from the front line.
In addition, the headquarters of the Anti-Terrorist Operation reported that the militants have intensified their aerial reconnaissance activities.
"During the last day our air defense forces identified seven militant drones, five of which carried out aerial reconnaissance near Mariupol," the report reads.
"In general, from 2000 on March 24 to midnight the militants fired on our positions six times, while four more cases of violation of the ceasefire were recorded from midnight to 0500," the report says.
As UNIAN reported earlier, one Ukrainian soldier was killed and another eight injured in the Donbas conflict zone over the last 24 hours.
