It is very strange. Of course the possible links should be investigated, that is the right and proper thing to do. But correlation does not mean casuation. As @Alsty's post details, reported blood clots in the vaccinated population is lower than would be expected in the general population. So you could argue it the other way, the vaccine actually helps to prevent blood clots!! (It doesn't). I can't help but feel that it might be yet another political decision from some EU nations although I really hope not. Surely the absolute known benefits of the vaccine outweigh a very small and unknown risk?