Terrorism -- 25 Terrorism 5 Prevention. -- 4 September 11 Terrorist Attacks, 2001 4 War on Terrorism, 2001-2009 4 Foreign relations -- 3 Islam 3 more ... Religious aspects -- 3 Terrorists 3 Emergency management -- 2 Islamic fundamentalism 2 Politics and government -- 2 Terrorists -- 2 Anti-Americanism 1 Biological warfare 1 Bioterrorism 1 Chemical warfare 1 Church and state -- 1 Citizen participation. -- 1 Civil rights -- 1 Criminology 1 Democracy -- 1 Emergency communication system -- 1 Globalization 1 Government policy -- 1 Hijacking of aircraft -- 1 History 1 Internal security -- 1 Interviews -- 1 Islamic fundamentalism -- 1 less ...