Victims remembered on 20th anniversary of Columbine shooting

A teacher and 12 students were murdered by two seniors, ushering in an era of school shootings across the country.
2:40 | 04/20/19

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Transcript for Victims remembered on 20th anniversary of Columbine shooting
Next to the grim anniversary back here it a home. 20 years ago today, the columbine high school massacre. Memories seared in the nation's mind of teenagers with their hands up, barely escaping after two seniors launched a violent planned attack killing 12 students and a teacher. A number of memorials and vigils this weekend. Many of the survivors now with children of their own. Here's ABC's Clayton Sandell. Reporter: Tonight, remembering the 12 students and 1 teacher murdered 20 years ago today at columbine high. On April 20, 1999, the forces of evil did not win. Darkness cannot win. Evil never has the last word. Death does not have the last word. Reporter: The day etched in history. When two students opened fire inside their school, a horror playing out on live TV. Fellow or former students T believed who rushed the schools and opened fire. Reporter: Columbine was not the first school shooting, but it marked a violent new era of deadly tragedy. Virginia tech, sandy hook, parkland and others. An ABC news investigation found columbine may have inspired more than 50 school attacks, plots threats. Just this week, police say an 18-year-old Florida high school senior who bought a shotgun, forcing more than 100 schools to shut down, had a columbine infatuation. In 1999, Sean graves was shot six times. I need to do more physical therapy before I'll know if I'll walk. Reporter: Now he fears for his own kids. Now that I'm a parent, I can't physically protect my daughter, 24 hours a day, 7 days a week, 365. Reporter: At columbine police were criticized for not moving today, officers are trained to confront the shooters immediately. Suspect down. The first day of class of a new school year, new semester, I'll walk in and be like, "Okay, where are the exits? Where is the best place to hide if something happens?" Reporter: The day also forever changing the way kids, parents and schools think about No doubt a dark turning points for our country, and Clayton, so powerful to hear from those survivors 20 years later, and we know that at the high school, the survivors and the students have tried to make this day more than just about the tragedy. Reporter: That's right, Tom. They call it a day of service. We saw hundreds of students, teachers and faculty picking up rakes and shovels, taking on dozens of community projects all to do a little bit of good, and just a few minutes ago, the current principal here at columbine told a memorial service crowd that columbine is not only a model of resiliency. It is thriving. Tom? Clayton Sandell for us Clayton, thank you.

This transcript has been automatically generated and may not be 100% accurate.

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