It is clear from some previous comments, apparently emanating from those not so experienced airline pilots (if they are pilots at all...
) that they perhaps have not flown to those parts of the world where, to inform ATC of this sort of threat, only serves to send the folks on the ground into a frenzy, which soon gets out of control, and makes life far more difficult for the operating crew.
It should be realised that airline flying does not begin and end at Heathrow, nor indeed other busy airports in continental Europe.
And, specific threats of this nature that includes actions of the crew (or not) to deal with that threat, are not really the place to discuss, on an open forum.