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Self-proclaimed Prime Minister of the pro-Russian separatist "Donetsk People's Republic" Alexander Borodai, center, stands as he arrives on the site of the crash of a Malaysian airliner carrying 298 people from Amsterdam to Kuala Lumpur, near the town of Shaktarsk, in rebel-held east Ukraine, on Thursday.

The plane was shot down over Ukraine by a surface-to-air missile Thursday but it was unclear who fired the weapon, U.S. officials said.