Rumors in the Aviation community. Aircraft breakup, and the cause, poorly designed composite parts, control surfaces (Vertical Stabilizer ah la NYC American Crash) and other suspects. Airbus will be in deep dark trouble after this. Their composite materials may not have been properly designed or certified for safe flight in all conditions.
If that plane broke up due to poor design, construction, or certification, they will be wishing it was terrorism. The alternates aren’t pretty for Airbus.