The operating theory is that a ground to air missile took out MH17 while it was in cruise flight at its assigned altitude, now being reported as 33,000 feet. The evidence we already have corroborates that theory. When an airplane crashes into the ground under power or as the pilots are trying to regain control, the scattering of the wreckage is always very contained, usually within an acre or so.
In this case, large parts have already started turning up miles away from each other, and that can only mean one thing: that the airplane broke apart at altitude and its parts descended on the currents of the wind until they impacted the earth. The higher the airplane was when it came apart, the more widely scattered the wreckage will be. We can conclude that MH17 came apart at a very high altitude. And it came apart very violently. I have seen a photograph of the floor structure of the airplane, torn apart at the metal structural ties, capable of withstanding many tens of thousands of pounds of force, resting in a field in rural Ukraine. The section in question weighs likely around 10,000 pounds. It’s not the kid of component that breaks off and flutters away. It was blown apart from the rest of the structure.
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The only explanations that make any sense given the widely scattered wreckage and the degree to which the airplane came apart are that it was hit by a missile — the working theory among authorities now — or that a bomb went off inside the airplane.
The difference between those two events will be immediately apparent to investigators once they see the wreckage. An explosion leaves an unmistakable fingerprint, telling forensics specialists where the explosive went off and whether that blast originated from inside or outside the aircraft.
Then, once they find the chemical signature of the device, they will be able to tell with great certainty what kind of explosive caused the damage and very likely where that charge was manufactured and by whom.