Terrorism -- Government policy -- 29 Prevention -- 27 Prevention. -- 23 Foreign relations -- 19 National security -- 17 History -- 12 more ... Terrorism 11 War on Terrorism, 2001-2009 11 Islam 8 Politics and government -- 8 Religious aspects -- 8 September 11 Terrorist Attacks, 2001 8 Prevention 7 Civil defense -- 6 Civil rights -- 6 Terrorists -- 6 War on terrorism, 2001- 6 Islamic fundamentalism -- 5 Psychological aspects 5 Security measures 5 Islamic fundamentalism 4 Political aspects -- 4 Politics and government 4 Security measures -- 4 Aeronautics, Commercial -- 3 Defenses 3 Emergency management -- 3 Government policy 3 Intelligence service -- 3 less ...