Sometimes different terrorist groups work together. There have been numerous summit meetings of terrorist groups but, more recently, radical Islamic groups have excluded non-Islamic groups from their summits. One must remember that terrorist organisations have infiltrated the western world, some of which are active and some of which have sleepers lying in wait for their day. In the interim they become part of the community they are about to terrorise. This could be for one month, one year or even longer. When one's neighbour unexpectedly turns out to be a suicide bomber or terrorist, it is the ultimate weapon. It is not only these terrorists we should fear but all the mutually supporting groups and organisations also. They may have different goals and objectives but they have a common bond – the desire to inflict terror to achieve their aims.