China appears to be expanding its network of secret detention facilities for Uyghurs and other Muslim minorities in Xinjiang, despite official claims that all detainees have been released from the camps.

Researchers at the Australian Strategic Policy Institute on Thursday challenged those claims with an investigation that found that the Xinjiang authorities had been expanding a variety of detention sites since last year.

As China faced rising international censure last year over its mass internment of Muslim minorities, officials asserted that the indoctrination camps in the western region of Xinjiang had shrunk as former camp inmates rejoined society as reformed citizens.

This week, the House of Representatives passed a law banning all imports from Xinjiang unless it is proven that they were not produced by forced labor.