Terrorism -- 95 Prevention 56 Prevention -- 25 Prevention. -- 23 Terrorism 22 National security -- 13 Government policy 10 more ... Government policy -- 9 War on Terrorism, 2001-2009 9 Security measures 8 International cooperation 7 Islam 7 Religious aspects -- 7 Terrorists -- 7 Politics and government -- 6 Psychological aspects 6 Aeronautics, Commercial -- 4 Civil defense -- 4 History 4 Foreign relations -- 3 Law and legislation -- 3 Psychology 3 Security measures -- 3 Social aspects 3 Weapons of mass destruction 3 Airports -- 2 Civil rights -- 2 Counterinsurgency -- 2 Emergency management -- 2 Evaluation. -- 2 less ...