Pre-Attack Behavior of Active Shooters in the US 2000 - 2013


The FBI's Report on Pre-Attack Behavior of Active Shooters in the U.S 2000 - 2013

This report well worth examining in the wake of any mass shooting tragedy. Our hearts go out to the victims of the 5/26/2021 Mass shooting victims in San Jose, CA minutes away from AAPI GO's HQ.

Key Takeaways from the Report


  • The 63 active shooters examined in this study did not appear to be uniform in any way such that they could be readily identified prior to attacking based on demographics alone.
  • Active shooters take time to plan and prepare for the attack, with 77% of the subjects spending a week or longer planning their attack and 46% spending a week or longer actually preparing (procuring the means) for the attack.
  • A majority of active shooters obtained their firearms legally, with only very small percentages obtaining a firearm illegally.
  • The FBI could only verify that 25% of active shooters in the study had ever been diagnosed with a mental illness. Of those diagnosed, only three had been diagnosed with a psychotic disorder.
  • Active shooters were typically experiencing multiple stressors (an average of 3.6 separate stressors) in the year before they attacked.
  • On average, each active shooter displayed 4 to 5 concerning behaviors over time that were observable to others around the shooter. The most frequently occurring concerning  behaviors were related to the active shooter’s mental health, problematic interpersonal interactions, and leakage of violent intent.
  • For active shooters under age 18, school peers and teachers were more likely to observe concerning behaviors than family members. For active shooters 18 years old and over, spouses/domestic partners were the most likely to observe concerning behaviors.
  • When concerning behavior was observed by others, the most common response was to communicate directly to the active shooter (83%) or do nothing (54%). In 41% of the cases the concerning behavior was reported to law enforcement. Therefore, just because concerning behavior was recognized does not necessarily mean that it was reported to law enforcement.
  • In those cases where the active shooter’s primary grievance could be identified, the most common grievances were related to an adverse interpersonal or employment action against the shooter (49%).
  • In the majority of cases (64%) at least one of the victims was specifically targeted by the active shooter.

Click Below to Read the Full Report
The FBI's Full Report is Available on their Website or Clicking the Photo








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