Table 2

Warning Signs in School Shooting Incidents

Predicted on the Basis of Past Studies^*	Occurred in Real Case Scenarios^†	High-Risk Factors
Uncontrolled anger	Threats of violence	Recent history of violence
History of aggression	Detailed plan, often communicated to others	Past history of violence
Threats of violence	Blames others for problems	History of suicidal behavior
Recent loss	History of aggression	Family history of violence
Symptoms of depression/hopelessness	Uncontrolled anger	History of substance abuse
Social isolation (real or perceived)	Depression and/or suicidal threats	Medical condition
Feelings of being persecuted or bullied	Poor coping and social skills	Use of medication
Access to firearms	Feelings of being rejected by peers	Access to and experience with weapons
	Feelings of being persecuted or bullied	Recent loss
	Access to firearms	Recent humiliation
	Fascination with weapons and explosives	Communication of violent intentions
	Organized for attack
	Lack of a prosocial support system
	Recent loss
	Lack of supervision at home