Terrorism -- 170 Terrorism 77 Prevention 62 Politics and government -- 28 Prevention -- 26 Prevention. -- 25 Islam 24 more ... National security -- 24 Politics and government 24 Religious aspects -- 24 Foreign relations -- 23 History 23 Security, International 23 World politics -- 21 War on Terrorism, 2001-2009 20 History -- 18 Terrorists -- 18 International relations 17 Islam and politics -- 15 Jihad 15 Psychological aspects 15 Government policy -- 14 Islam -- 13 Economic aspects 11 Foreign relations 11 Government policy 11 International cooperation 11 Islam and politics 11 Military policy 11 September 11 Terrorist Attacks, 2001 11 less ...