Sunday marks 15 years since two students walked into Columbine High School and killed 12 of their classmates and a teacher.
More than 20 others were injured.
Senators Mark Udall and Michael Bennet issued statements Sunday regarding the 15th anniversary of the tragedy.
"Fifteen years ago, Colorado communities were shaken by a horrific act of violence at Columbine High School, where 12 students and a teacher tragically lost their lives and many others were injured," Udall said. "In the wake of this act of violence, Coloradans came together to be there for their friends and neighbors, and stood united as one community. On this somber anniversary, let's remember the victims, honor the resilience of the survivors and collaborate to find ways to reduce these types of senseless tragedies."
“Fifteen years ago we lost 13 young, innocent lives. Colorado and our local communities were changed forever. As we reflect on that horrible day, parents are reminded of our worst fears and can’t help but see the faces of our own children in the memories of the kids we lost. After a series of tragedies in Colorado and around the country that have been all too similar, today serves as a moment to recommit ourselves to preventing these acts of senseless violence from ever happening again,” Bennet said in a news release.
Family and friends gathered at the Columbine memorial Saturday, just as they do every year, to remember the victims of the tragedy. The names of those who were killed were read out loud.
Coni Sanders' dad was a coach at Columbine who was killed.
"I know my dad is..he's with me everyday..coaching me silently..like he did the kids at Columbine," Sanders said of her father.
“We are part of an unwanted family. None of us asked to be part of this family, family of survivors of mass tragedy,” said Sanders.