Thousands of files including photographs from China's secretive system of mass imprisonment in Xinjiang are among a huge cache of data hacked from police computer servers in the region. They appear to show signs of distress among Uyghur inmates, with armed guards visible in the background. East Asia correspondent Bill Birtles tells The World the so-called "Xinjiang police files" were passed on to the BBC earlier this year, and authenticated by experts months later.

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