China is facing growing criticism over its persecution of some Muslim minority groups, huge numbers of whom are allegedly being held in internment camps.In August, a UN committee heard that up to one million Uighur Muslims and other Muslim groups could be being detained in the western Xinjiang region, where they're said to be undergoing "re-education" programmes.
The claims were made by rights groups, but China denies the allegations. At the same time, there's growing evidence of oppressive surveillance against people living in Xinjiang.
Human Rights Watch says Uighur people in particular are subject to intense surveillance and are made to give DNA and biometric samples. Those with relatives in 26 "sensitive" countries have reportedly been rounded up, and up to a million detained. Rights groups say people in camps are made to learn Mandarin Chinese and criticise or renounce their faith.
Former prisoners told BBC of physical as well as psychological torture in the camps. Entire families had disappeared, and we were told detainees were tortured physically and mentally. We also saw evidence of almost a complete surveillance state in Xinjiang.
There's growing international criticism of China's treatment of Uighur Muslims but, as of yet, no country has taken any action beyond issuing critical statements.