Originally Posted by ETOPS
What evidence is, so far, that this aircraft has actually crashed?
None. All we know with reasonable certainty is that after an uneventful cruise at F370 with normal communications, ADS-B signal was lost just inside Cairo FIR, no further communication was received from the aircraft, and if we can trust the Greek minister's statement, primary radar tracked its descent to FL100 after which it was lost over the horizon.
Everything else at present is extrapolation/speculation.
While an unlikely scenario, the point of disappearance is exactly in the middle of the "blind spot" for both Greek and Egyptian primary radar below FL100, and there are plenty of runways in Northern Libya within expected endurance where an A320 could land. Hiding it after daybreak from prying satellite eyes is another story, and were this the case we would probably have heard the demands by now...