Regardless of cause, putting that puzzle back together had to be a PITA. It sure appears from the picture of the remains that the explosion happened right under the center of the wing. If it was a missile wouldn't it hit an engine?
"How fortunate for leaders that men do not think."
- Adolf Hitler
Let me tell you, when a wild (you think) Bobcat jumps up, lays in your lap and starts purring, you by-God pet that Bobcat. - Eric