There is no single internationally accepted definition of what constitutes terrorism, IEP accepts the terminology and definitions agreed to by the authors of the GTD, the National Consortium for the Study of Terrorism and Responses to Terrorism (START) researchers and its advisory panel. The GTI therefore defines terrorism as “the threatened or actual use of illegal force and violence by a non-state actor to attain a political, economic, religious, or social goal through fear, coercion, or intimidation”.[2] This definition recognises that terrorism is not only the physical act of an attack, but also the psychological impact it has on a society for many years after.