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Ukraine says Donetsk 'anti-terror operation' under way

15 April 2014 Last updated at 19:12 BST

Ukraine's acting President Olexander Turchynov has announced the start of an "anti-terrorist operation" against pro-Russian separatists.

He told parliament it was being conducted "stage by stage, in a responsible... manner".

Hours later, gunfire was heard at an airbase which officials said had been in the hands of militants.

Daniel Sandford reports.