Dozens of people gathered for a vigil on Friday on the 20th anniversary of the Columbine high school massacre, laying flowers at a memorial for the victims. Twelve students and a teacher were killed on April 20, 1999, when two teenagers armed with an assortment of weapons and home-made bombs went on the rampage at the school, whose name has become synonymous with school shootings.

Dozens pay tribute to Columbine massacre victims on 20th anniversary

Demanding an end to gun violence and tougher restrictions on firearm sales, thousands of students again walked out of classes across the United States on Friday in hopes of putting pressure on politicians ahead of November's midterm elections

US students walk out again to protest gun violence

The Ocala shooting came when thousands of students across the United States staged walkouts to mark the 19th anniversary of the massacre at Columbine High School

Shooting at Florida school on Columbine High School massacre's 19th anniversary

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columbine high-school-massacre

Dozens pay tribute to Columbine massacre victims on 20th anniversary

US students walk out again to protest gun violence

Shooting at Florida school on Columbine High School massacre's 19th anniversary