Icing?
BoxcarWilhomena, you might be right. I just watched the local TV news and they announced that “extreme icing may have played a major role” and “a collision with migrating birds can definitely be ruled out”. It was however left unclear if this was an official statement or not.
A note about the crash site: Within 15m of touchdown the aircraft hit an embankment of about 3-4m height. It is indeed a sad turn of fate that they didn’t have that little extra kinetic energy as the very soft field behind would have been suitable for an emergency landing.
Greetings
BeePee