Terrorism -- Prevention 34 Prevention -- 28 Terrorism 28 Foreign relations -- 20 Government policy -- 20 Religious aspects -- 20 more ... Islam 19 History -- 18 National security -- 13 War on terrorism, 2001- 13 Terrorists -- 11 Politics and government -- 10 Psychological aspects 9 September 11 Terrorist Attacks, 2001 8 International cooperation 6 Islam and politics -- 6 Jihad 6 Politics and government 6 Psychology 6 Radicalism -- 6 Congresses -- 5 Islamic fundamentalism -- 5 Military policy 5 Political aspects 5 World politics -- 5 Case studies 4 Government publications -- 4 History 4 International relations 4 less ...