Terrorism -- Prevention 63 Terrorism 34 Prevention -- 27 Prevention. -- 22 Psychological aspects 18 Islam 16 more ... Religious aspects -- 16 War on Terrorism, 2001-2009 16 Terrorists -- 15 Government policy -- 14 National security -- 14 History 12 Foreign relations -- 11 Government policy 10 Psychology 10 Politics and government -- 9 History -- 8 International cooperation 8 Security measures 8 September 11 Terrorist Attacks, 2001 7 Social aspects 7 Economic aspects 6 Jihad 6 Weapons of mass destruction 6 Finance 5 Islamic fundamentalism -- 5 Aeronautics, Commercial -- 4 Civil defense -- 4 Forecasting 4 less ...