Government policy -- Terrorism -- 6 September 11 Terrorist Attacks, 2001 4 War on terrorism, 2001- 3 Intelligence service -- 2 National security -- 2 War on Terrorism, 2001-2009 2 more ... Biography -- 1 Evaluation. -- 1 Foreign relations -- 1 Governmental investigations -- 1 Islamic fundamentalism -- 1 Jihad 1 Political violence -- 1 Prevention. -- 1 Social networks 1 Terrorism 1 Terrorists -- 1 less ...