Terrorism -- 112 Prevention 68 Prevention -- 30 Terrorism 30 Prevention. -- 24 National security -- 14 Government policy -- 12 more ... Government policy 11 War on Terrorism, 2001-2009 10 International cooperation 8 Security measures 8 Terrorists -- 8 Islam 7 Religious aspects -- 7 Politics and government -- 6 Psychological aspects 6 Aeronautics, Commercial -- 4 Civil defense -- 4 History 4 Social aspects 4 Child terrorists 3 Foreign relations -- 3 Human rights 3 Law and legislation 3 Law and legislation -- 3 Politics and government 3 Psychology 3 Security measures -- 3 Security, International 3 Weapons of mass destruction 3 less ...