U.S. intelligence analysts were trying to determine whether the missile was launched by separatists in Ukraine or by Russian forces positioned across the border from the crash site, the officials said.
Malaysia Airlines said that it lost contact with the plane, Flight 17 from Amsterdam to Kuala Lumpur, about 30 miles from the Russian-Ukrainian border. Photos from the scene showed the blackened wreckage of the plane and bodies scattered in a field.
President Barack Obama said the U.S. government was working to determine whether Americans were on board.
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