The US man who gunned down nine people in Dayton, Ohio two years ago had fantasised about mass shootings, serial killings and murder-suicide for at least a decade before carrying out the August 4, 2019, attack, the FBI said as it announced the conclusion of its investigation.
Shooter Connor Betts didn't share specific details with friends or family members about his fantasies, underscoring the importance of people being attuned to subtle changes in an individual, the agency said.
A phenomenon known as "bystander fatigue" may account why no one reported Betts to authorities before the shooting, according to a two-page FBI summary of its report.
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