Terrorism -- Prevention 97 Terrorism 77 Prevention -- 57 Government policy -- 35 Islam 32 Religious aspects -- 32 more ... National security -- 26 Prevention. -- 25 Psychological aspects 25 Terrorists -- 24 Foreign relations -- 23 History 21 History -- 21 Government policy 16 War on Terrorism, 2001-2009 16 Psychology 14 International cooperation 13 War on terrorism, 2001- 13 Politics and government 12 Politics and government -- 12 September 11 Terrorist Attacks, 2001 11 Social aspects 10 Foreign relations 9 Political aspects 9 Islamic fundamentalism -- 8 Jihad 8 Radicalism -- 8 Security measures 8 Weapons of mass destruction 8 less ...