It was supposed to be a crucial part of Barack Obama’s plan to close Guantánamo Bay. But frustrated officials say the special review board designed to speed up the closure of the detention camp in Cuba contains a major flaw which allows the process to grind almost to a halt.

Known as the Periodic Review Board (PRB), a multi-agency panel has convened since 2013 to determine whether the hardest cases at Guantánamo – the so-called “forever prisoners” officials have deemed too dangerous to release but for whom they possess insufficient evidence to charge – still pose a threat to the US or its allies. ...

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