A leak of thousands of photos and official documents from China's Xinjiang has shed new light on the violent methods used to enforce mass internment in the region, researchers said Tuesday.
The files, obtained by academic Adrian Zenz, were published as UN human rights chief Michelle Bachelet begins a long-awaited and controversial trip to Xinjiang.
Activists say Chinese authorities have detained more than one million Uighurs and other mostly Muslim minorities in a network of detention centres and prisons in the region, which Beijing has defended as training centres.
But the trove of police photographs and internal documents — sent to Mr. Zenz by an anonymous source who hacked into official databases in Xinjiang — add to evidence that the mass internments were far from voluntary, with leaked documents showing top leaders in Beijing including President Xi Jinping calling for a forceful crackdown.
The files include a 2017 internal speech by Chen Quanguo, a former Communist Party secretary in Xinjiang, in which he allegedly orders guards to shoot to kill anyone who tries to escape, and calls for officials in the region to "exercise firm control over religious believers".
A 2018 internal speech by public security minister Zhao Kezhi mentions direct orders from Xi to increase the capacity of detention facilities.
After initially denying their existence, Beijing has claimed the facilities are vocational training schools, attended voluntarily and aimed at stamping out religious extremism.
But the leaked documents give an insight into how leaders saw the minority population as a security threat, with Zhao warning that more than two million people in southern Xinjiang alone had been "severely influenced by the infiltration of extremist religious thought".
More than 2,800 police photos of Xinjiang detainees included minors such as 17-year-old Zeytunigul Ablehet, detained for listening to an illegal speech, and 16-year-old Bilal Qasim, apparently sentenced for being related to other detainees.
The details echo a separate police list leaked earlier to AFP which showed the government crackdown snaring hundreds of people at a time from villages, often many from the same household.
"The sort of paranoid threat perception comes out in these files, and the internal justification for why one has to move against an entire population," said Mr. Zenz in video comments published alongside the leaked files.
Mr. Zenz works for the U.S.-based non-profit organisation the Victims of Communism Memorial Foundation.
The files, parts of which have been verified by multiple news organisations including the BBC and Le Monde, also provide a window into life in detention facilities.
Photos appear to show officers restraining hooded and shackled inmates with batons, while other guards wearing camouflage stand by with firearms.
U.K. Foreign Secretary Liz Truss on Tuesday called the details of the newly leaked documents "shocking", and urged China to grant Bachelet "full and unfettered access to the region so that she can conduct a thorough assessment of the facts on the ground".
But China's Foreign Ministry dismissed the leaked documents as "cobbled-together material" by "anti-China forces smearing Xinjiang", with spokesman Wang Wenbin accusing media of "spreading lies and rumours".