A Ukrainian military officer says that Russian forces resumed their shelling of a steel plant in war-torn Mariupol immediately after the partial evacuation of civilians from the port city.

Ukrainian National Guard brigade commander Denys Shlega said Sunday in a televised interview that the shelling began as soon as rescue crews ceased evacuating the Azovstal steel mill of civilians.

Shlega says that at least one more round is needed to clear civilians from the plant. He says dozens of small children remain in bunkers below the industrial facilities.