Beijing hit back Wednesday at a US move to ban imports from China's northwestern Xinjiang region over claims of forced labour, bemoaning a "fabricated lie" it says is intended to hurt Chinese business.
The US House of Representatives voted overwhelmingly on Tuesday in favour of the ban over claims of systematic forced labour in Xinjiang, where activists say more than one million Uighurs and other mostly Muslim Turkic-speaking people have been incarcerated in camps.
Beijing reacted angrily over the move, saying that it was "maliciously slandering the human rights situation in China's Xinjiang".
"China expresses strong indignation and firm opposition, and had already made stern representations to the US," said foreign ministry spokesman Wang Wenbin at a regular press briefing.
"Xinjiang affairs are purely China's internal affairs. The US had no right to interfere. The so-called forced labour issue is a completely fabricated lie by certain western organisations and individuals," he said.
Wang went on to accuse the US of using the claims of forced labour to "restrict and oppress Xinjiang businesses".
Swedish clothing giant H&M said this month it was ending its relationship with a Chinese yarn producer over the labour accusations.
Xinjiang is a global hub for cotton with one study by a labour group estimating that 20 percent of the garments imported into the United States contain at least some yarn from the region.
The Uighur Forced Labor Prevention Act still needs to be passed by the Senate before becoming law.
Speaking before the vote US House Speaker Nancy Pelosi said the "products of the forced labour often end up here in American stores and homes".
Last week Beijing published a white paper staunchly defending its policy in Xinjiang, where it says training programmes, work schemes and better education mean life has improved.
It has defended the training centres as necessary to stamp out extremism.
But US Homeland Security officials have described them as facilities run like a "concentration camp".