Students from Columbine High School in Littleton, Colorado, watch as the last of their fellow students are evacuated from the building on April 20, 1999 following a shooting spree carried out by Eric Harris and Dylan Klebold that left 12 students and 1 teacher dead.
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Patrick Ireland, 17, is pulled from a school library window by SWAT team members during the massacre at Columbine High School in 1999.
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Students run from Columbine High School under cover from police during the shooting on April 20, 1999.
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Columbine high school students run to the safety of buses after being rescued by SWAT teams from inside the high school.
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Columbine High School track and football coach Andy Lowry bends to one knee and bows his head after escaping the school shooting.
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A woman embraces her daughter after they were reunited following the shooting at Columbine High School in Littleton, Colo., on Tuesday, April, 20, 1999.
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Members of a police SWAT team take a break in front of Columbine High School on April 20, 1999.
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Columbine High School students hug each other next to a car belonging to classmate Rachel Scott, 17, who was killed in the school shooting.
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Seven of the students and the teacher among those killed during the Columbine High School massacre on April 20, 1999
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Unidentified young women evacuate Columbine High School during the school shooting 20 years ago.
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Fran Allison, right, comforts her daughter Brooke during their reunion following the shooting at Columbine High School in Denver on Tuesday, April, 20, 1999.
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A young girl signs Rachel Scott’s casket on April 24, 1999, during funeral services for the victim of the shooting at Columbine High School.
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Classmates of Kelly Fleming pay their final during the interment ceremony for Fleming in Wheatridge, Colo., on April 26, 1999. Fleming’s boyfriend, who was also killed in the massacre, was buried a few feet away earlier that day.
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Doreen and John Tomlin hug well-wishers in front of the casket of their son John Robert Tomlin before his funeral at the Community United Methodist Church Wednesday, April 28, 1999, in Waterford, Wisconsin. Tomlin was killed in the library at Columbine High School in Littleton, Colorado.
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A woman reaches out to touch the John Tomlin cross in the 15 cross memorial erected on a hilltop near Columbine High School in Littleton, April 29, 1999.
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A participant at a memorial service for the victims of the Columbine High School shooting rampage holds a “NO GUNS” sign in Littleton, Colorado, on Sunday, April 25, 1999.
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Roger Kovacs and his wife Lesli sit quietly in front of a memorial to Roger’s friend Rachel Scott and other victims of the Columbine High School shootings in 1999, at Chapel Hill Memorial Gardens on April 20, 2007 in Littleton, Colorado.
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Will Beck, a Columbine High School massacre survivor, reacts while placing flowers at the Columbine Memorial at Clement Park in Littleton, Colorado, during a community vigil for the 20th anniversary of the Columbine High School mass shooting on April 19, 2019.
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Kailey Slusher’s shadow is cast on the Columbine Memorial on April 19, 2019 in Littleton, Colorado. April 20, 2019 marks 20 years since the shooting that claimed 13 lives at Columbine High School in Littleton, Colorado.
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Attendees walk through the Columbine Memorial during a vigil at the site for the victims of the massacre at Columbine High School nearly 20 years ago Friday, April 19, 2019, in Littleton, Colorado.
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