Aftermath of Marjory Stoneman Douglas attack by Emilee McGovern / SOPA Images
Students visit the memorial site of the 17 lives lost at Marjory Stoneman Douglas, on the one month anniversary, during a nationwide school walkout.
19-year-old Nikolas Cruz killed 17 people at Marjory Stoneman Douglas High School in Parkland, Florida by shooting with a AR-15 semi automatic rifle. It is one of the world's deadliest school massacres.
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