Washington • Most students who committed deadly school attacks over the past decade were badly bullied, had a history of disciplinary trouble and their behavior concerned others but was never reported, according to a U.S. Secret Service study released Thursday.
In at least four cases, attackers wanted to emulate other school shootings, including those at Columbine High School in Colorado, Virginia Tech University and Sandy Hook Elementary School in Connecticut. The research was launched following the shooting at Marjory Stoneman Douglas High School.
The study by the Secret Service's National Threat Assessment Center is the most comprehensive review of school attacks since the Columbine shootings in 1999.