Terrorism -- 541 Terrorism 281 Prevention 123 Foreign relations -- 83 Islam 78 Prevention -- 78 Religious aspects -- 76 more ... Government policy -- 54 National security -- 54 War on terrorism, 2001- 50 History -- 43 War on Terrorism, 2001-2009 43 Politics and government -- 41 Terrorists -- 38 September 11 Terrorist Attacks, 2001 35 Prevention. -- 34 World politics -- 32 Jihad 28 Psychological aspects 26 History 24 International relations 22 Islam and politics -- 22 Politics and government 22 Political aspects 20 Military policy 19 Government policy 18 International cooperation 18 Islamic fundamentalism 18 Islamic fundamentalism -- 18 Security, International 18 less ...