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There were no specific warnings that Betts would one day commit a crime, the FBI said, despite having \"suicidal and violent fantasies\" for over a decade.

\"This underscores the importance of bystanders’ attentiveness to more subtle changes an individual may exhibit that could be indicative of their decision to commit violence, such as a change in personal circumstances, an increase in perceived stressors, or language indicating they may be contemplating suicide,\" the FBI said.

One reason that family and friends did not alert authorities about Betts was potentially because of \"bystander fatigue,\" according to the report. Bystander fatigue occurs when people around the suspect don't pay attention or take any action \"due to their prolonged exposure to the person’s erratic or otherwise troubling behavior over time,\" according to the Behavioral Analysis Unit.

\"PHOTO:
Scott Olson/Getty Images, FILE
PHOTO: Dion Green is comforted by his uncle Randy Southhall during the funeral of his father Derrick Fudge at St. John Missionary Baptist Church on Aug. 10, 2019, in Springfield, Ohio.
>

The special agent in charge of the FBI's Cincinnati field office said there were some technical issues with the investigation that made it harder to get to the bottom of what happened.

\"Finding answers for the victims and their families has been a driving motivator each day,\" FBI Cincinnati Special Agent in Charge J. William Rivers said in a statement.

\"From the start, this has been a thorough and deliberate investigation. Due to technical challenges accessing lawfully acquired evidence that was encrypted, this investigation has taken significantly longer than expected,\" he said. \"However, we are confident that it has uncovered the key facts and that we have done everything in our ability to provide answers to all those impacted by this horrible attack.\"

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