Loud explosions have been heard in the centre of the eastern Ukrainian city of Donetsk this morning, witnesses said.
Donetsk is one of the cities at the heart of the uprising against Kiev from pro-Russian rebels.
Ukraine's prime minister Petro Poroshenko has vowed to retake the city as part of what Kiev calls its "anti-terrorist operation" against separatist fighters.
Thousands of online users have taken to social media to call for the victims of the Malaysian airliner crash to be returned to loved ones.
United States intelligence officials admitted that they do not know who fired the surface-to-air missile that downed flight MH17.
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