A UN human rights committee has heard there are credible reports that China is holding a million Uighurs in “counter-extremism centres”.
Gay McDougall, a member of the UN Committee on the Elimination of Racial Discrimination, raised the claims at a two-day UN meeting on China.
She said she was concerned by reports that Beijing had “turned the Uighur autonomous region into something that resembles a massive internment camp”.
China did not immediately respond.
The Uighurs are a Muslim ethnic minority mostly based in China’s Xinjiang province. They make up around 45% of the population there.
Xinjiang is officially designated as an autonomous region within China, like Tibet to its south.
The World Uyghur Congress said in its report that detainees are held indefinitely without charge, and forced to shout Communist Party slogans.
It said they are poorly fed, and reports of torture are widespread.
Most inmates have never been charged with a crime, it is claimed, and do not receive legal representation.
China is said to carry out the detentions under the guise of combating religious extremism.
In April, Laura Stone, a senior diplomat in the US State Department, said tens of thousands of people had been detained in “re-education centres” amid a government crackdown.
In response, Chinese Foreign Ministry spokeswoman Hua Chunying stated that, “everyone can see that people of all ethnicities in Xinjiang live and work in peace and contentment and enjoy peaceful and progressing lives”.