Public opinion is in no doubt that the heinous assault against the United States on 11 September 2001 was ‘terrorist’ in nature. It was unexpected and therefore created a great shock, not only in the United States but also around the entire world. The targets, namely the World Trade Center in New York and the Pentagon near Washington DC, were selected consciously. The fatalities and causalities of the attacks were enormous. It was the first time since Pearl Harbor that the US territory was directly hit by an attack initiated from abroad. The weaponry used in these attacks was neither conventional, like guns or bombs, nor weapons of mass destruction; it was means of public transport.