Barbed wire surrounds the walls around a cluster of schools on the outskirts of Kashgar, in western China’s Xinjiang region, August 31, 2018.

© 2018 AP Photo/Ng Han Guan

This was one of the lines officials were instructed to deliver to children returning to Xinjiang and learning that their family members had been sent to “political education” camps, according to a trove of Chinese documents leaked to and published by the New York Times.

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