The United States on Thursday banned imports from five more Chinese companies over alleged human rights abuses involving the Uyghurs, according to a government posting, as part of its effort to eliminate goods made with forced labor from the U.S. supply chain.

The companies include Hong Kong-based Rare Earth Magnesium Technology Group Holdings and its parent, Century Sunshine Group Holdings, which manufacture magnesium fertilizer and magnesium alloy products. Also included is Zijin Mining Group subsidiary Xinjiang Habahe Ashele Copper Co, which mines nonferrous metals.

The targeted companies did not immediately respond to requests for comment.

The companies were added to the Uyghur Forced Labor Prevention Act Entity List, which restricts imports tied to what the U.S. government characterizes as an ongoing genocide of minorities in China's western Xinjiang region.

The list now includes over 70 entities tied to products that include cotton apparel, automotive parts, vinyl flooring and solar panels.

The list identifies those who work with the government of the Xinjiang Uyghur Autonomous Region to recruit and transport Uyghurs, Kazakhs, Kyrgyz or members of other persecuted groups out of the region, and those who source material from the region or from people who work with the government of Xinjiang.

U.S. officials say Chinese authorities have established labor camps for Uyghurs and other Muslim minority groups in Xinjiang. Beijing denies any abuses.