Terrorism -- 23 Terrorism 6 Prevention. -- 4 September 11 Terrorist Attacks, 2001 4 Islam 3 Religious aspects -- 3 Terrorists -- 3 more ... War on Terrorism, 2001-2009 3 Foreign relations -- 2 Islamic fundamentalism 2 Politics and government -- 2 Psychological aspects 2 Radicalism -- 2 Terrorists 2 War on terrorism, 2001- 2 Anti-Americanism 1 Church and state -- 1 Citizen participation. -- 1 Civil rights -- 1 Criminology 1 Democracy -- 1 Emergency communication system -- 1 Emergency management -- 1 Government policy -- 1 Hate crimes -- 1 Hijacking of aircraft -- 1 History 1 Internal security -- 1 Interviews -- 1 Islamic fundamentalism -- 1 less ...