The government of ukraine has air defenses in the region where the plane went down. Ukraine says prorussian separatists are behind the crash, while Vladimir Putin says ukraines military campaign against the separatists is to blame for this. Were going to cover all angles of the story for you. And meanwhile, in israel, how long will the ground operation last . And is the showdown with hamas spinning out of control . Were going to take you there live as well. So lets get right to the very latest on flight 17. Back with me now is our chief National Correspondent jim sciutto. Jim, thanks for joining us again. What do u. S. Officials belief happened here and who do they believe is responsible . Well, theyll give an answer to the first question, not to the second question. They believe the plane was taken down by a surfacetoair missile for two reasons. One, u. S. Assets in the region detected a Missile System locking on the radar of a Missile System locking on to this jet before it disappear
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