The National School Walkout marked the 19th anniversary of the Columbine High School massacre in Colorado.
Connecticut high school pupil Lane Murdock set up the event in the wake of the Parkland shooting in Florida.
Only one hour before the walkout was due to begin, authorities say a student in Ocala, Florida was shot in the ankle at the Forest High School.
One teenager posted a photo of a barricade that his class constructed after hearing the gunshot.
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