Terrorism -- 352 Terrorism 213 Prevention 102 Prevention -- 57 Foreign relations -- 39 Government policy -- 36 Islam 34 more ... Religious aspects -- 33 National security -- 29 Terrorists -- 27 War on terrorism, 2001- 27 Prevention. -- 26 History -- 25 Psychological aspects 25 World politics -- 25 History 22 War on Terrorism, 2001-2009 22 Government policy 17 September 11 Terrorist Attacks, 2001 16 Psychology 15 Politics and government 14 Politics and government -- 14 International cooperation 13 International relations 13 Jihad 13 Political aspects 13 Security, International 12 Social aspects 12 Terrorists 12 Security measures 11 less ...