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Students get stones to ward off shooters

Florida school shooting: playing for the 17. Sportshour. Audio, 00:03:51Florida school shooting: playing for the 17

US guns: Why I'm marching on Washington

Why this mass shooting is different - the evidence. Video, 00:03:30Why this mass shooting is different - the evidence

US shooting survivors arrive for DC rally. Video, 00:00:33US shooting survivors arrive for DC rally

Illustrating this turbulent time in American story. Video, 00:02:22Illustrating this turbulent time in American story

Citigroup to restrict client gun sales

Clear backpacks for school after shooting

'It's easier to buy a gun than spray paint'

The art of the US gun reform movement

'Greatest nightmare - our children attacked' Video, 00:00:27'Greatest nightmare - our children attacked'

Police arrest Florida suspect's brother

The teenagers taking on the US gun lobby

Florida survivors: Don't arm teachers

Cop lingers outside Florida school attack. Video, 00:01:04Cop lingers outside Florida school attack

US church gunman's sister in knife arrest

Stars support students' mass gun protest

US students in mass walkout for gun reform

Student walkouts: 'We're voting in 2020' Video, 00:02:19Student walkouts: 'We're voting in 2020'

Students stage mass walkouts over Florida. Video, 00:00:52Students stage mass walkouts over Florida

Shoes mark young US gun victims. Video, 00:01:42Shoes mark young US gun victims

Dunblane sends support after Florida shooting