Terrorism -- 112 Prevention 65 Prevention. -- 31 Prevention -- 27 Terrorism 24 National security -- 17 War on Terrorism, 2001-2009 12 more ... Government policy 10 Government policy -- 10 Security measures 9 International cooperation 8 Islam 8 Religious aspects -- 8 Terrorists -- 8 Politics and government -- 6 Psychological aspects 6 Civil defense -- 5 Aeronautics, Commercial -- 4 Foreign relations -- 4 History 4 Intelligence service -- 4 Weapons of mass destruction 4 Evaluation. -- 3 Jihad 3 Law and legislation 3 Law and legislation -- 3 Psychology 3 Security measures -- 3 Security, International 3 September 11 Terrorist Attacks, 2001 3 less ...