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The Obama administration believes that about 12 detainees released from the prison at Guantanamo Bay, Cuba, have launched attacks against U.S. or allied forces in Afghanistan, killing about a half-dozen Americans, according to..."
https://www.washingtonpost.com/world/national-security/about-12-released-guantanamo-detainees-implicated-in-deadly-attacks-on-americans/2016/06/08/004d038e-2776-11e6-b989-4e5479715b54_story.html
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