likely from a lot of people who have spoken on this that the plane was affected by some kind of human action. you've been checking with intelligence sources. what are officials saying about that possibility that they were intentionally shut down, and are they still holding out the possibility that those were just mechanical -- shut down automatically somehow? >> reporter: they're holding out every possibility at this point. because they have to, right? they haven't determined anything definitively. they're still gathering the clues. from the beginning i've had a consistent view read from intelligence officials when it comes to the terror angle them saying we have nothing to indicate terrorism but we haven't ruled it out. but that's just one explanation, of course. mechanical failure or something, a plane suicide -- a pilot suicide rather like we saw with the egyptair flight. i brought and i have here the device that shows how easy it is to turn off that transponder in there which would take a human decision but it's very easy. just flip the switch. transponder's off. but that requires a human being

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