Subject
Mass murder
30
Mass murder Prevention
8
Fort Hood Shooting, Fort Hood, Tex., 2009
7
Military bases Security measures
6
Soldiers Crimes against
6
Criminal snipers
5
Security clearances
5
Emergency management
4
Facilities
4
Firearms and crime
4
Gun control
4
Law enforcement Planning
4
Mass murderers
4
Public buildings Security measures
4
Security measures
4
Violence
4
Violence in the workplace Prevention
4
Government property Security measures
3
Mass murder History
3
Mass murder investigation
3
Rules and practice
3
School shootings
3
Violent crimes
3
Airports Security measures
2
Criminal psychology
2
Domestic terrorism Prevention
2
Employee screening
2
Intelligence service
2
Intergovernmental cooperation
2
Mass burials
2
Mass murderers Psychology
2
Murderers
2
Terrorism Religious aspects Islam
2
United States Officials and employees Selection and appointment
2
Violence Forecasting
2
Violence in the workplace
2
Atrocities
1
Campus violence
1
Colorado Theater Shooting, Aurora, Colo., 2012
1
Criminal behavior, Prediction of
1
Cults
1
Employee screening Government policy
1
Ex-cultists
1
Excavations (Archaeology)
1
Faculty
1
Firearms
1
Firearms ownership
1
Forensic pathology
1
Friends and associates
1
Genocide Political aspects
1
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