Terrorism Terrorists Religious aspects 17 Islam 16 Psychology 13 Prevention 9 Jihad 8 more ... History 4 Islamic fundamentalism 4 Recruiting 4 War on Terrorism, 2001-2009 4 Government policy 3 Psychological aspects 3 Communication 2 Group identity 2 International relations 2 Islam and politics 2 Political aspects 2 Political violence 2 September 11 Terrorist Attacks, 2001 2 Social aspects 2 Social networks 2 Violence 2 Biological warfare 1 Boston Marathon Bombing, Boston, Mass., 2013 1 Chemical warfare 1 Communication and culture 1 Communication in organizations 1 Communication in politics 1 Computer network resources 1 less ...