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Pictures | Sun Apr 21, 2019 | 5:15pm BST

Remembering the Columbine massacre

Cassanda Sadusky, survivor of the attack, looks at a line of crosses commemorating those killed in the Columbine High School shooting on the 20th anniversary of the attack in Littleton, Colorado, April 20, 2019. REUTERS/Rick Wilking

Cassanda Sadusky, survivor of the attack, looks at a line of crosses commemorating those killed in the Columbine High School shooting on the 20th anniversary of the attack in Littleton, Colorado, April 20, 2019. REUTERS/Rick Wilking

Cassanda Sadusky, survivor of the attack, looks at a line of crosses commemorating those killed in the Columbine High School shooting on the 20th anniversary of the attack in Littleton, Colorado, April 20, 2019. REUTERS/Rick Wilking
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Sean Graves, shot six times in the Columbine high school shooting, sheds a tear with his wife Kara at his side at a ceremony to commemorate the 20th anniversary of the attack in Littleton, Colorado, April 20. Graves was paralyzed from the neck down but after dozens of surgeries can now walk. REUTERS/Rick Wilking

Sean Graves, shot six times in the Columbine high school shooting, sheds a tear with his wife Kara at his side at a ceremony to commemorate the 20th anniversary of the attack in Littleton, Colorado, April 20. Graves was paralyzed from the neck down...more

Sean Graves, shot six times in the Columbine high school shooting, sheds a tear with his wife Kara at his side at a ceremony to commemorate the 20th anniversary of the attack in Littleton, Colorado, April 20. Graves was paralyzed from the neck down but after dozens of surgeries can now walk. REUTERS/Rick Wilking
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A woman pushes a stroller, against the rising full moon, as she visits the Columbine memorial in Littleton, Colorado, April 19. REUTERS/Rick Wilking

A woman pushes a stroller, against the rising full moon, as she visits the Columbine memorial in Littleton, Colorado, April 19. REUTERS/Rick Wilking

A woman pushes a stroller, against the rising full moon, as she visits the Columbine memorial in Littleton, Colorado, April 19. REUTERS/Rick Wilking
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Will Beck, a survivor of the attack, cries on arrival at the Columbine memorial in Littleton, Colorado, April 19. REUTERS/Rick Wilking

Will Beck, a survivor of the attack, cries on arrival at the Columbine memorial in Littleton, Colorado, April 19. REUTERS/Rick Wilking

Will Beck, a survivor of the attack, cries on arrival at the Columbine memorial in Littleton, Colorado, April 19. REUTERS/Rick Wilking
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Craig Scott, brother of Rachel Scott who was killed in Columbine, listens at a ceremony in Littleton, Colorado, April 20. REUTERS/Rick Wilking

Craig Scott, brother of Rachel Scott who was killed in Columbine, listens at a ceremony in Littleton, Colorado, April 20. REUTERS/Rick Wilking

Craig Scott, brother of Rachel Scott who was killed in Columbine, listens at a ceremony in Littleton, Colorado, April 20. REUTERS/Rick Wilking
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A man leans against the Columbine memorial in Littleton, Colorado, April 19. REUTERS/Rick Wilking

A man leans against the Columbine memorial in Littleton, Colorado, April 19. REUTERS/Rick Wilking

A man leans against the Columbine memorial in Littleton, Colorado, April 19. REUTERS/Rick Wilking
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Former Columbine principal Frank DeAngelis cries as he is introduced at a remembrance service at Waterstone Community Church in Littleton, Colorado, April 18. REUTERS/Rick Wilking

Former Columbine principal Frank DeAngelis cries as he is introduced at a remembrance service at Waterstone Community Church in Littleton, Colorado, April 18. REUTERS/Rick Wilking

Former Columbine principal Frank DeAngelis cries as he is introduced at a remembrance service at Waterstone Community Church in Littleton, Colorado, April 18. REUTERS/Rick Wilking
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Girls in Columbine T-shirts listen at a ceremony in Littleton, Colorado, April 20. REUTERS/Rick Wilking

Girls in Columbine T-shirts listen at a ceremony in Littleton, Colorado, April 20. REUTERS/Rick Wilking

Girls in Columbine T-shirts listen at a ceremony in Littleton, Colorado, April 20. REUTERS/Rick Wilking
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Visitors carry LED candles as they visit the Columbine memorial in Littleton, Colorado, April 19. REUTERS/Rick Wilking

Visitors carry LED candles as they visit the Columbine memorial in Littleton, Colorado, April 19. REUTERS/Rick Wilking

Visitors carry LED candles as they visit the Columbine memorial in Littleton, Colorado, April 19. REUTERS/Rick Wilking
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A woman wearing a Class of 2000 blanket looks at the Columbine memorial with her child in Littleton, Colorado, April 19. REUTERS/Rick Wilking

A woman wearing a Class of 2000 blanket looks at the Columbine memorial with her child in Littleton, Colorado, April 19. REUTERS/Rick Wilking

A woman wearing a Class of 2000 blanket looks at the Columbine memorial with her child in Littleton, Colorado, April 19. REUTERS/Rick Wilking
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Dawn Anna, mother of Lauren Townsend who was killed in Columbine, looks at her daughter's marker at the Columbine memorial in Littleton, Colorado, April 19. REUTERS/Rick Wilking

Dawn Anna, mother of Lauren Townsend who was killed in Columbine, looks at her daughter's marker at the Columbine memorial in Littleton, Colorado, April 19. REUTERS/Rick Wilking

Dawn Anna, mother of Lauren Townsend who was killed in Columbine, looks at her daughter's marker at the Columbine memorial in Littleton, Colorado, April 19. REUTERS/Rick Wilking
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A visitor looks at the Columbine memorial in Littleton, Colorado, April 19. REUTERS/Rick Wilking

A visitor looks at the Columbine memorial in Littleton, Colorado, April 19. REUTERS/Rick Wilking

A visitor looks at the Columbine memorial in Littleton, Colorado, April 19. REUTERS/Rick Wilking
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Visitors walk through the Columbine memorial in Littleton, Colorado, April 19. REUTERS/Rick Wilking

Visitors walk through the Columbine memorial in Littleton, Colorado, April 19. REUTERS/Rick Wilking

Visitors walk through the Columbine memorial in Littleton, Colorado, April 19. REUTERS/Rick Wilking
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Columbine survivor Crystal Woodman-Miller speaks at a remembrance service at Waterstone Community Church in Littleton, Colorado, April 18. REUTERS/Rick Wilking

Columbine survivor Crystal Woodman-Miller speaks at a remembrance service at Waterstone Community Church in Littleton, Colorado, April 18. REUTERS/Rick Wilking

Columbine survivor Crystal Woodman-Miller speaks at a remembrance service at Waterstone Community Church in Littleton, Colorado, April 18. REUTERS/Rick Wilking
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Sean Graves, shot six times in the Columbine high school shooting (L), hugs Patrick Ireland, shot in the head in the shooting, at a ceremony to commemorate the attack in Littleton, Colorado, April 20. Graves was paralyzed from the neck down but after dozens of surgeries can now walk. REUTERS/Rick Wilking

Sean Graves, shot six times in the Columbine high school shooting (L), hugs Patrick Ireland, shot in the head in the shooting, at a ceremony to commemorate the attack in Littleton, Colorado, April 20. Graves was paralyzed from the neck down but after...more

Sean Graves, shot six times in the Columbine high school shooting (L), hugs Patrick Ireland, shot in the head in the shooting, at a ceremony to commemorate the attack in Littleton, Colorado, April 20. Graves was paralyzed from the neck down but after dozens of surgeries can now walk. REUTERS/Rick Wilking
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The Queen City Pipe Band closes a ceremony to commemorate the attack in Littleton, Colorado, April 20. REUTERS/Rick Wilking

The Queen City Pipe Band closes a ceremony to commemorate the attack in Littleton, Colorado, April 20. REUTERS/Rick Wilking

The Queen City Pipe Band closes a ceremony to commemorate the attack in Littleton, Colorado, April 20. REUTERS/Rick Wilking
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A woman looks at a line of crosses commemorating those killed in the Columbine High School shooting in Littleton, Colorado, April 20. REUTERS/Rick Wilking

A woman looks at a line of crosses commemorating those killed in the Columbine High School shooting in Littleton, Colorado, April 20. REUTERS/Rick Wilking

A woman looks at a line of crosses commemorating those killed in the Columbine High School shooting in Littleton, Colorado, April 20. REUTERS/Rick Wilking
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