Heavy shelling in east Ukraine increases fears over ceasefire

DONETSK Ukraine (Reuters) - Heavy shelling resumed around the pro-Russian separatist stronghold of Donetsk in eastern Ukraine on Tuesday, a Reuters witness said, increasing concerns a ceasefire between the rebels and government forces could crumble.

Volleys of mortar bomb fire could be heard from the city centre every few minutes, though it was unclear who had launched them or what was under fire. Fighting has often centred around Donetsk airport which is outside the city centre.