U.S. scrambles to determine who fired Russian-made missile at jet

Satellite images show a plume of smoke left by the ground-to-air missile that brought down Malaysia Airlines flight 17. Infrared sensors recorded the moment when the airliner exploded.

As U.S. analysts sift through fragments of intelligence to try to pin down who fired the missile and why, and where it came from, they are running into difficult questions.

The U.S. assessment, outlined by Ambassador Samantha Power at the U.N. Security Council on Friday, is that the airliner was "likely downed by a surface-to-air missile, an SA-11, operated from a separatist-held location in eastern Ukraine."

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