Enlarge A hack on police servers in China’s Xinjiang region has yielded thousands of graphic images and videos of Uighur detainees suffering in detention camps in one of the starkest accounts yet of the ongoing humanitarian crisis caused by the country’s persecution of ethnic minorities. The images are accompanied by training manuals, detailed police work rosters, and instructions for guarding the camps. Using a euphemism to describe inmates, one document states: “If students do not respond to warning shots and continue to try to escape, the armed police shoot to kill,” the BBC reported . Images show one prisoner in...