Witnesses in the Ukrainian port of Mariupol reported sustained explosions outside the city and a volunteer battalion of Ukrainian fighters said that Grad rockets had been fired at its positions.
Russia's War Against Ukraine
The Observer: Ukraine ceasefire under threat amid claims of shelling near crucial port city
Ukrainian army soldiers ride a tank on a road near where pro-Russian separatists fired heavy artillery, on the outskirts of the key southeastern port city of Mariupol, on Sept. 5, 2014.
