By John Sudworth
China is deliberately separating Muslim children from their families, faith and language in its far western region of Xinjiang, according to new research.
At the same time as hundreds of thousands of adults are being detained in giant camps, a rapid, large-scale campaign to build boarding schools is under way.
Based on publicly available documents, and backed up by dozens of interviews with family members overseas, the BBC has gathered some of the most comprehensive evidence to date about what is happening to children in the region.
Records show that in one township alone more than 400 children have lost not just one but both parents to some form of internment, either in the camps or in prison.