U.S. President Barack Obama will make a statement about the situation in Ukraine at 10:50 am (3:50pm BST), the White House says. David Cameron is also due to speak on the crisis shortly.
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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