Prevention -- Terrorism -- 9 National security -- 8 Congresses 6 Congresses -- 5 Emergency management -- 2 Government policy 2 more ... Security measures -- 2 African American police -- 1 Computer networks -- 1 Cross, Alex (Fictitious character) -- 1 Cyberspace -- 1 Cyberterrorism -- 1 Defenses -- 1 Emergency managemen 1 Epidemics -- 1 Fiction 1 Fiction -- 1 Influenza -- 1 International cooperation -- 1 Maritime terrorism -- 1 Merchant marine -- 1 Police -- 1 Police psyschologists -- 1 Political planning -- 1 Political violence -- 1 Prevention 1 Security, International -- 1 congresses 1 less ...