The BBC has been given rare access to the vast system of highly secure facilities thought to be holding more than a million Muslims in China’s western region of Xinjiang.

Authorities there insist they are just training schools. But the BBC’s visit uncovers important evidence about the nature of the system and the conditions for the people inside it.

Watch more: China's vanishing mosques

Our World: Inside China's Camps can be seen on BBC World News at varying times during the week from Saturday 13 July 2019.