In a self-made video recording sent to the news media by Seung-Hui Cho prior to his committing the Virginia Tech shootings , he referred to the Columbine massacre as an apparent motivation . In the recording , he wore a backwards baseball cap and referred to Harris and Klebold as " martyrs . " Adam Lanza , the perpetrator of the Sandy Hook Elementary School shooting , had " an obsession with mass murders , in particular , the April 1999 shootings at Columbine High School in Colorado . " The Tumblr fandom gained widespread media attention in February 2015 after three of its members conspired to commit a mass shooting at a Halifax mall on Valentine 's Day . In 2017 , two 15-year-old school boys from Northallerton in England were charged with conspiracy to murder after becoming infatuated with the crime and " hero-worshipping " Harris and Klebold
Sandy Hook Elementary School shooting
Sandy Hook Elementary School shooting
The Columbine Effect