Terrorism -- Prevention 93 Terrorism 74 Prevention -- 55 Government policy -- 34 Islam 31 Religious aspects -- 31 more ... National security -- 26 Prevention. -- 25 Psychological aspects 25 Terrorists -- 23 Foreign relations -- 22 History -- 21 History 20 War on Terrorism, 2001-2009 16 Government policy 15 Psychology 14 International cooperation 13 War on terrorism, 2001- 13 Politics and government -- 12 Politics and government 11 September 11 Terrorist Attacks, 2001 11 Foreign relations 9 Political aspects 9 Social aspects 9 Islamic fundamentalism -- 8 Security measures 8 Weapons of mass destruction 8 Case studies 7 Economic aspects 7 less ...