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Children looking out of a classroom window as a police officer stands guard at Dunblane primary school, Scotland, shortly after the shooting incident on the premises. The Dunblane school massacre was one of the deadliest mass murders in UK history, when gunman Thomas Hamilton killed sixteen children and one teacher at Dunblane primary school near Stirling, Scotland on 13 March 1996, before killing himself. As a result of the killings, two new Firearms Acts were passed, which effectively made pri (Photo by Colin McPherson/Corbis via Getty Images)