More than 100 prisoners fled from a high-security prison in eastern Ukraine after it was hit by shelling in the rebel stronghold of Donetsk, local authorities have said.

Sustained shelling in the main rebel stronghold in eastern Ukraine struck residential buildings and a hospital, killing at least four people and wounding 10 others, officials said, as government forces pressed forward in their campaign to rout the separatists.

Sustained shelling in the main rebel stronghold in eastern Ukraine has struck residential buildings and a hospital, killing at least four people and wounding 10 others.