![Gun dealer Mel Bernstein holds an M-60 machine gun in his gun shop outside Colorado Springs April 27. Bernstein alerted federal authorities that school shooting suspects Dylan Klebold and Eric Harris, along Gun dealer Mel Bernstein holds an M-60 machine gun in his gun shop outside Colorado Springs April 27. Bernstein alerted federal authorities that school shooting suspects Dylan Klebold and Eric Harris, along](https://c8.alamy.com/zooms/6/f847ac99c7184df3867e5f283144c40b/2d5ddby.jpg)
Gun dealer Mel Bernstein holds an M-60 machine gun in his gun shop outside Colorado Springs April 27. Bernstein alerted federal authorities that school shooting suspects Dylan Klebold and Eric Harris, along
![Serial Killers on Twitter: "A month before the shooting, Dylan wrote an english essay about a man killing people. His teacher was worried and told his parents." / Twitter Serial Killers on Twitter: "A month before the shooting, Dylan wrote an english essay about a man killing people. His teacher was worried and told his parents." / Twitter](https://pbs.twimg.com/tweet_video_thumb/CcVHgMQXEAUpoOu.jpg)
Serial Killers on Twitter: "A month before the shooting, Dylan wrote an english essay about a man killing people. His teacher was worried and told his parents." / Twitter
![Two teenagers 'dressed up like Columbine killers and threatened other students' - World News - Mirror Online Two teenagers 'dressed up like Columbine killers and threatened other students' - World News - Mirror Online](https://i2-prod.mirror.co.uk/incoming/article6781348.ece/ALTERNATES/s615b/Two-students-dress-like-Columbine-killers.jpg)
Two teenagers 'dressed up like Columbine killers and threatened other students' - World News - Mirror Online
![Columbine shooting's myths: Eric Harris and Dylan Klebold weren't Trench Coat Mafia or outcasts - The Washington Post Columbine shooting's myths: Eric Harris and Dylan Klebold weren't Trench Coat Mafia or outcasts - The Washington Post](https://arc-anglerfish-washpost-prod-washpost.s3.amazonaws.com/public/QJLNFCDCFYI6TH7SVPEYJXE65Q.jpg)
Columbine shooting's myths: Eric Harris and Dylan Klebold weren't Trench Coat Mafia or outcasts - The Washington Post
![Revealed, British boy accused of plotting new Columbine massacre: Teenager 'compiled hit list of pupils and teachers he wanted to eliminate' | Daily Mail Online Revealed, British boy accused of plotting new Columbine massacre: Teenager 'compiled hit list of pupils and teachers he wanted to eliminate' | Daily Mail Online](https://i.dailymail.co.uk/i/pix/2014/03/04/article-2573356-1C085F4600000578-677_634x445.jpg)