DONETSK, Ukraine, July 21 (Reuters) - Loud explosions were heard in the centre of the eastern Ukrainian city of Donetsk on Monday, a Reuters witness said.
Donetsk is at the heart of a rebel uprising against rule by Kiev and Ukrainian President Petro Poroshenko has vowed to retake the city as part of what Kiev calls its "anti-terrorist operation" against the separatists.
(Reporting by Anton Zverev, writing by Elizabeth Piper, Editing by Timothy Heritage)
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