Hare-haren ta’addancin da aka fuskanta a New York, a satumban shekara ta 2001 da kuma watan maris na wannan shekarar a Madrid sun isa zama gargadi a game da muhimmancin hadin kai tsakanin mahukuntan leken asiri na kasa da kasa domin kandagarkin wani sabon harin da ka yi sanadiyyar rayukan wasu dubban mutane nan gaba.
