Terrorism -- 118 Prevention 71 Prevention. -- 31 Prevention -- 28 Terrorism 25 National security -- 17 War on Terrorism, 2001-2009 13 more ... Government policy -- 11 Terrorists -- 11 Government policy 10 Psychological aspects 9 Security measures 9 International cooperation 8 Islam 8 Religious aspects -- 8 Politics and government -- 6 Psychology 6 Civil defense -- 5 Foreign relations -- 5 Aeronautics, Commercial -- 4 History 4 Intelligence service -- 4 Weapons of mass destruction 4 Evaluation. -- 3 Human rights 3 Jihad 3 Law and legislation 3 Law and legislation -- 3 Security measures -- 3 Security, International 3 less ...