A news agency reported it shot down by a missle, but then ukraine embassy reported it was engine failure A video of it emerged on twitter..showing that it was fire in the air and ignited just as before it hit the ground it also abruptly stopped sending flight data back which someone suggested wasn't engine failure but an actual hit by a missile so no to the QRS11 theory at the time of this writing, now 5 hrs later we know a lot more about the situation