In 2006 it was estimated that there were over 109 different definitions of terrorism.Arie W. Kruglanski and Shira Fishman Current Directions in Psychological Science Vol. 15, No. 1 (Feb. 2006), pp. 45–48 American political philosopher Michael Walzer in 2002 wrote: "Terrorism is the deliberate killing of innocent people, at random, to spread fear through a whole population and force the hand of its political leaders". Bruce Hoffman, an American scholar, has noted that it is not only individual agencies within the same governmental apparatus that cannot agree on a single definition of terrorism. Experts and other long-established scholars in the field are equally incapable of reaching a consensus.
