Littleton, Colorado: Students run out of the Columbine High School as 2 gunmen went on a shooting spree killing fifteen, including themselves.
Tyler Vielie walks past crosses with the names of the victims of the Columbine High School shooting next to the Columbine Memorial on April 20, 2021...
View of flowers and tokens left at a makeshift memorial in remembrance of 13 victims at Columbine High School, Littleton, Colorado, April 21, 1999....
Crosses with the names and portraits of the victims of the 1999 Columbine High School massacre are seen at the Chapel Hill Memorial Gardens in...
Students from Columbine High visit the Columbine Memorial at Clement Park in Littleton, Colorado, before a community vigil for the 20th anniversary...
Police patrol outside Columbine High School on April 17, 2019 in Littleton, Colorado, as all Denver-area schools were evacuated and classes cancelled...
Police patrol outside Columbine High School on April 17, 2019 in Littleton, Colorado, as all Denver-area schools were evacuated and classes cancelled...
Expressions of Grief in the Columbine Community after the Columbine High School Shooting, April 20, 1999.
Littleton, Colorado: Some 70,000 people gather at a memorial service to honor the people killed in the Columbine High School shooting.
In this file photo school children hug each other in the parking lot 21 April 1999 outside Columbine High School in Littleton, CO, the site of a...
School children hug each other in the parking lot 21 April 1999 outside Columbine High School in Littleton, CO, the site of a school shooting on 20...
Police patrol outside Columbine High School on April 17, 2019 in Littleton, Colorado, as all Denver-area schools were evacuated and classes cancelled...
Students gather at the Light of the World Catholic Church for a memorial service honoring the victims of the Columbine High School shooting. On April...
Expressions of Grief in the Columbine Community after the Columbine High School Shooting, April 20, 1999.
Expressions of Grief in the Columbine Community after the Columbine High School Shooting, April 20, 1999.
Mourners hug each other outside Light of The World Catholic Church where a memorial service for victims of a shooting spree in Columbine High School...
Kacey Revis drives a row of crosses to commemorate the dead from the Columbine HS shooting, put up in Clement Park, in Littleton Colorado, within...
Mourners arrive with flowers at Columbine High School in Littleton, Colo., where two teenagers shot to death 12 students and a teacher before killing...
View of flowers and tokens left at a makeshift memorial in remembrance of 13 victims at Columbine High School, Littleton, Colorado, April 21, 1999....
Friends of the victims of the 20 April 1999 Columbine High School shooting embrace after the moment of silence observed statewide during a ceremony...
Expressions of Grief in the Columbine Community after the Columbine High School Shooting, April 20, 1999.
Community members pay their respects as fifteen crosses line the hillside above Columbine High Schooin Littleton, Colo., on April 28, 1999.
North Yarmouth Academy sophomores, from far right, Will Tatge, Eliza Tod, Bronwen Ramsey-Brimberg and Afton Morton stand in a line on Main Street in...
Tom Mauser, the father of Columbine High School shooting victim, Daniel Mauser is interviewed as people gather to lay out approximately 7,000 pairs...
Dark storm clouds gather over Columbine High School just one month after the tragic shootings. In May of 1999, students Eric Harris and Dylan Klebold...
Littleton, Colorado: Columbine shrine to the fifteen people killed in the Columbine High School massacre. The shrine is on a hill near the school.
Sheriffs John Dunaway & John Stone) showing 3 weapons used by Columbine High School student gunmen Eric Harris & Dylan Klebold in their April assault...
Knives used by Eric Harris and Dylan Klebold during the shooting at Columbine High School April 20, 1999 in Columbine, CO. The photographs of the...
Expressions of Grief in the Columbine Community after the Columbine High School Shooting, April 20, 1999.
Rhonda Grindle places crosses with the names of the victims of the Columbine High School shooting next to the Columbine Memorial on April 20, 2021 in...
Crosses with the names of the victims of the Columbine High School shooting sit next to the Columbine Memorial on April 20, 2021 in Littleton,...
Amber Johnson writes a note for the Columbine High School shooting victims with friends Jessi Wilson Kira Osado and Krystal Osado 26 April 1999 at...
At the Denver Civic Center Amphitheater, at a candlelight vigil for victims of the Columbine HS shootings, Tamara Tatar writes her sentiments on a...
Mourners hug each other before heading into Light of The World Catholic Church for a memorial service for victims of a shooting spree in Columbine...
Candles wrap around a collection of flowers at the Columbine Memorial at Clement Park in Littleton, Colorado, during a community vigil for the 20th...
People gather to honor and remember loved ones at the Columbine Memorial at Clement Park in Littleton, Colorado, during a community vigil for the...
Visitor places a candle among flowers at the Columbine Memorial at Clement Park in Littleton, Colorado, during a community vigil for the 20th...
People arrive to attend "Columbine 20 Years Later: A Faith-based Remembrance Service" for the victims of the Columbine High School shooting at...
Little over 100 North Yarmouth Academy students from the middle and upper school line Main Street in Yarmouth during a student-organized silent...
Palo Verde High School student Jake Grosvenor holds a sign outside the school as he participates in the National School Walkout on the 19th...
Palo Verde High School student Ainslee Archibald holds a sign outside the school as she participates in the National School Walkout on the 19th...
Columbine student Amelie Van Hess holds a sign during the Vote For Our Lives rally and vigil at Columbine High School on April 19, 2018 in Littleton,...
Leah Zundel a students at Columbine High School, holds a sign that reads "Enough is Enough" as she and other students walked out of classes in...
Expressions of Grief in the Columbine Community after the Columbine High School Shooting, April 20, 1999.
Expressions of Grief in the Columbine Community after the Columbine High School Shooting, April 20, 1999.
Expressions of Grief in the Columbine Community after the Columbine High School Shooting, April 20, 1999.
People hold a small prayer service next to crosses with the names of the victims of the Columbine High School shooting near the Columbine Memorial on...
Vice President Al Gore hugs Columbine High School Principal Frank DeAngelis after laying flowers at the base of a wreath in Clement Park 25 April...
View from the parking lot at the rear of Columbine High School in Littleton, CO, shows the cafeteria and library with windows missing 22 April at the...
Colorado State student Rebecca Airy, left, is comforted by her mom Linda while visiting the memorial to the Columbine High School victims at Clement...
Will Beck, a Columbine High School massacre survivor, reacts while placing flowers at the Columbine Memorial at Clement Park in Littleton, Colorado,...
Spencer Greenlee, a senior a Columbine High School prays at the Columbine Memorial at Clement Park in Littleton, Colorado, during a community vigil...
Police patrol outside a locked Columbine High School on April 17, 2019 in Littleton, Colorado, as all Denver-area schools were evacuated and classes...
Members of the media gather outside Columbine High School on April 17, 2019 in Littleton, Colorado, as all Denver-area schools were evacuated and...
Tom Mauser, whose son Daniel was killed in the Columbine high school shooting, holds up Daniel's shoe as he joins New York City Mayor Michael R....
On the anniversary of the Columbine shooting, thousands of New York teenagers walk out of school to attend a gun control rally and call for sweeping...
Yorktown High School junior Zoe Coutlakis holds a sign on the West Lawn of the US Capitol after rallying with several hundred fellow students to call...
Sam Craig, a Chatfield High School student and co-director of Vote For Our Lives, holds up a sign reading $3.94 during a rally and vigil at Columbine...
View of crosses erected in remembrance of victims at Columbine High School, Littleton, Colorado, April 21, 1999. Two former students, Eric Harris and...
Tom Mauser, father of Daniel Mauser who was killed in the Columbine High School shooting, gets the crowd fired up at Civic Center Park for the March...