Going by that last report of flames, it could well have been a bomb or shoot down.
Remember the comment by the satirical columnist, Roger Bacon, in Flight International many years ago ?
He declared that he was going to fly a pilotless aircraft full of explosive over the next Farnborough Airshow, and remotely detonate it, so that - for once - 50,000 spectators could DEFINITELY state that the aircraft exploded in flight and was on fire before hitting the ground.