News report, that the aircraft hit the ground with 700 km/h.
If that is true, it must be above the VNO at that altitude. I do not fly the Airbus, but I know, that it has overspeed protection, if it is operated normally (normal law or something).
I find it very weird and to rule out "deliberate act" at this point is too early - remember the Embraer in Namibia.