Doubtless the investigating authorities are considering every possibility. But, given the reports that wreckage was strewn across a large area - suggesting a mid-flight break-up - it would be smart to at least consider and investigate the possibility of sabotage, should it be established threats had previously been made. Seems a bit too early, for me, for anyone to push for any ruling-in, or ruling-out. Time will tell, maybe. In such early days it is worth everyone keeping an open mind, I suggest. Fly safe my German friends