Terrorism -- Prevention 59 Terrorism 32 Prevention -- 26 Prevention. -- 22 Islam 16 Religious aspects -- 16 more ... War on Terrorism, 2001-2009 16 Psychological aspects 15 National security -- 14 Government policy -- 13 History 12 Terrorists -- 12 Foreign relations -- 10 Government policy 10 Politics and government -- 9 International cooperation 8 Security measures 8 Psychology 7 September 11 Terrorist Attacks, 2001 7 Social aspects 7 History -- 6 Jihad 6 Weapons of mass destruction 6 Economic aspects 5 Finance 5 Islamic fundamentalism -- 5 Aeronautics, Commercial -- 4 Civil defense -- 4 Intelligence service -- 4 less ...