The United States announced Monday it would block a range of Chinese products made by “forced labour” in the Xinjiang region, including from a “vocational” center that it branded a “concentration camp” for Uighur minorities.

“The Chinese government is engaged in systematic abuses against the Uighur people” and other minorities, said Mark Morgan, acting commissioner of the Customs and Border Protection agency.

“Forced labour is an atrocious human rights abuse,” he said. The products include cotton, garments, hair products and electronics from five specific manufacturers in Xinjiang as well as adjacent Anhui.

It also included all products tied to the Lop County No. 4 Vocational Skills Education and Training Center in Xinjiang, which Homeland Security Acting Deputy Secretary Ken Cuccinelli said was a center of forced labor.

“This is not a vocational center, it is a concentration camp, a place where religious and ethnic minorities are subject to abuse and forced to work in heinous conditions with no recourse and no freedom,” Cuccinelli told reporters.,”This is modern day slavery.”

The actions announced consisted of “withhold release orders” or WROs, which empower the CBP to seize products from the blacklisted companies and organizations.

The US government is increasingly using such orders to pressure Beijing over its detention of more than one million members of the mostly Muslim Uighur minority in Xinjiang for ostensible reeducation.

In July, the customs agency placed WRO blocks on hair products, used for wigs and extensions, from several companies operating in Xinjiang, and in August did the same for garments made and sold by the Hero Vast Group. “The Chinese government needs to close its concentration camps,” said Cuccinelli.