Subject
September 11 Terrorist Attacks, 2001
251
Terrorism Prevention
191
Terrorists
183
National security
97
Terrorism
69
Terrorists Recruiting
57
Terrorists Travel Prevention
56
Terrorists Identification
49
Terrorism Religious aspects Islam
46
Islamic fundamentalism
39
Terrorists Legal status, laws, etc
35
Terrorism Prevention Government policy
32
Jihad
30
September 11 Terrorist Attacks, 2001 Health aspects
30
War on Terrorism, 2001-2009
29
Rules and practice
26
National security Law and legislation
25
September 11 Terrorist Attacks, 2001 Influence
25
Terrorists Government policy
25
Visas Government policy
24
United States Foreign relations
23
Terrorists Recruiting Prevention
22
Terrorism Government policy
19
Terrorist organizations
19
Admission of nonimmigrants Government policy
17
Detention of persons
17
September 11 Terrorist Attacks, 2001 Environmental aspects
17
Skyscrapers Fires and fire prevention
17
Trials (Terrorism)
17
Domestic terrorism Prevention
16
International travel regulations Security measures
16
Detention of persons Government policy
15
Management
15
Skyscrapers
15
Terrorism Prevention International cooperation
15
Appropriations and expenditures
14
Domestic terrorism
14
Emergency management
14
Internet and terrorism
14
Military courts
14
Structural stability
14
Victims of terrorism Legal status, laws, etc
14
Airline passenger security screening
13
Border security
13
Intelligence service Evaluation
13
Middle East
13
Radicalism
13
September 11 Terrorist Attacks, 2001 Economic aspects
13
Terrorism Prevention Law and legislation
13
Terrorists Psychology
13
more ...