The Federal Bureau of Investigation (FBI) concentrates on the inherent ambiguity issues that can define the domestic terrorism. FBI has stated that the domestic terrorism happens because the citizens of America often attack the Americans based on the extremist ideologies. It is mostly because of U.S based extremist ideology that can be considered as the inherent ambiguity issue for defining the domestic terrorism. Domestic terrorism has international roots and active followers in other countries. The counting numbers for the process of prosecutions of the terrorists in general is really difficult after the era of 9/11 attack.