Under the watch of armed guards, the prisoners must walk to the fields while overseers wearing red vests and holding police dogs monitor them, the two prison employees told Radio Free Asia.

Armed soldiers surrounded the work area, some on horseback, to prevent any from escaping.

“I witnessed prisoners being forcibly taken out to work during the day and returned to their cells at night,” said the prison employee – a Uyghur himself – who has worked at the prison for nine years, including one as a “team leader” of a group of inmates, although he was not allowed to mingle or talk much with them.

Many inmates also work in factories located inside and outside the prison walls producing cement, shoes, gloves and tea, a prison guard told RFA Uyghur.

Those serving sentences of more than 10 years work in factories inside the prison yard, while those serving less than 10 years work outside the prison, the guard told RFA.

Who are Uyghur Muslims?

Uyghur Muslims are a Turkic minority ethnic group originating from and culturally affiliated with the general region of Central and East Asia.

The Uyghurs are recognized as native to the Xinjiang Uyghur Autonomous Region of the People's Republic of China.