Terrorism -- 413 Terrorism 201 Prevention 105 Islam 65 Religious aspects -- 62 Foreign relations -- 52 Prevention -- 51 more ... War on Terrorism, 2001-2009 43 National security -- 41 Government policy -- 34 Terrorists -- 34 Prevention. -- 32 Politics and government -- 30 History -- 28 September 11 Terrorist Attacks, 2001 28 War on terrorism, 2001- 27 Psychological aspects 24 Jihad 23 History 22 World politics -- 21 Islam and politics -- 19 Islamic fundamentalism 18 Islamic fundamentalism -- 17 International relations 15 Security, International 15 International cooperation 13 Political aspects 13 Psychology 13 September 11 Terrorist Attacks, 2001 -- 13 Social aspects 13 less ...