China Xinjiang police state: Fear and resentment
As Theresa May visits China, the UK government has raised concerns over religious freedom in the country's mainly Muslim province of Xinjiang.
One man, who fled the country for Turkey, has told the BBC he'll "pay for the bullet" to kill his family to save them from a detention camp.
John Sudworth reports from Xinjiang, where all filming and reporting by foreign media is tightly controlled.
01 Feb 2018