China's Hidden Camps

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China is accused of locking up as many as a million Uighur Muslims without trial across its western region of Xinjiang. The government denies the claims, saying people willingly attend special "vocational schools" to combat "terrorism and religious extremism". But a BBC investigation has found important new evidence of the reality - a vast and rapidly growing network of detention centres, where the people held inside are humiliated and abused. Using detailed satellite analysis and reporting from a part of the country where journalists are routinely detained and harassed; China correspondent John Sudworth offers his in-depth report on China's Hidden Camps.