Plumes of smoke darken the sky above a sunflower seed crushing factory outside Donetsk, the largest stronghold of the Russian-backed separatists surrounded by Ukraine's advancing army. "It was hit by Grad missiles," says a rebel waving his machinegun as he guards a checkpoint next to a bullet-riddled bus.
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Smoke rises from a factory hit by rockets during clashes between Ukrainian forces and rebels, Donetsk, east of Ukraine, July 21.
