The story came from Sky News, they reported it initially as unconfirmed and ran it for a few minutes on Skytext, but they have now withdrawn it. Suspect it may not be true.
It would appear to be very difficult to black out such a story in this day and age.
However I do wonder what happened to the jet that was reported hijacked and on its way to Washington - maybe this was confused for the one that crashed.
Maybe this thread should be deleted.