I recently had an interesting conversation with a Russian engineer I've known for a number of years; according to him, he knows at least one of the investigators into this crash and apparently the bomb theory is not universally accepted.
This is proper rumour and should be treated as such; anyway, the story goes that, firstly, the cabin pressure did not spike before falling as one might expect from an internal explosion and, secondly, the sober assessment is one of catastrophic engine failure, hull breach, fuel fire and of course the tail falling off.
Looking at the pictures here (and the video on that page)
http://www.pprune.org/rumours-news/5...an-fir-46.html how does this alternative take on events pan out? It's frustrating being unable to see each piece of wreckage in the wider context; the engines and their parts do look very separated from the wings.
I'll leave it to those who know their stuff to dismiss this idea.