Ukraine, Russia Trade Blame in Donetsk Shelling; 8 Dead

People surround a damaged trolley bus that was shelled, killing at least 13 people, in Donetsk, Ukraine, Jan. 22, 2015.

This still image captured from video footage shows a bus that was destroyed by shelling in Donetsk, Jan. 22, 2015.

An interior view shows a damaged bus, hit by mortar fire. A Reuters cameraman said he saw six bodies on the ground near and inside the bus, Donetsk, Jan. 22, 2015.

Members of the Ukrainian armed forces inspect a car at a checkpoint on the outskirts of Kostyantynivka, in the Donetsk region of Ukraine, Jan. 22, 2015.

This still image captured from video footage shows a burned-out car destroyed by shelling in Donetsk, Jan. 22, 2015.

Local residents remove debris from a house damaged by recent shelling in Donetsk, Jan. 21, 2015.