Of course it was a bomb
I can't believe there is still discussion on whether this was a bomb, of course it was. check out the photos of the almost 'unrolled' fuselage sections posted on 5th Nov @ 19:19, or 6th Nov @17:01. (Sorry for some reason I don't seem able to attach images or files, anyone explain why not?) The second in particular shows skin deformed more away from internal stiffeners, and together they just shout 'internal overpressure'. You don't need to take it from unnamed 'intelligence' sources (the same as those who identified non existent WMD in Iraq...), just look.