skyclear1984, in a much earlier post it was stated that there was a bird alert in force, and another poster (if I remember correctly) stated that landing there on the same day there was a lot of bird activity.
As you are from Italy I am surprised you think bird-strike double flame out is SO rare. Never mind the Hudson (albeit on departure), have you already forgotten Ciampino ? I still wouldn't be surprised if this was number 3.