At least three Chinese celebrities on Saturday dropped German fashion house Hugo Boss , the latest foreign brand caught in a concerted boycott by Chinese consumers over Western accusations of forced labour in Xinjiang.

Among the celebrities who ended their pacts with Hugo Boss was actor-singer Li Yifeng, who said in a statement through his agent on the Twitter-like microblog Weibo that he would only cooperate with brands that specifically support and procure cotton from the farwestern Chinese region.

Activists and U.N. rights experts have accused China of using mass detainment, torture, forced labour and sterilisations on Uighurs in Xinjiang. China denies these claims and says its actions in the region are necessary to counter extremism.

Hugo Boss, in a post on its Weibo account on Thursday, said it would "continue to purchase and support Xinjiang cotton." But it said on Friday that it was not an authorised post, and had been deleted accordingly.

In an email to Reuters on Friday, company spokeswoman Carolin Westermann said an undated English-language statement on its website stating that "so far, HUGO BOSS has not procured any goods originating in the Xinjiang region from direct suppliers" was its official position.

On Saturday, the brand's Weibo account issued a new statement saying it cherished all longstanding relationships with partners in China.

Hugo Boss China did not immediately reply to a Reuters request for comment.

Chinese internet users have accused Hugo Boss for backtracking on its position, saying the brand was being "two faced", with some vowing to boycott the brand for good.

"A two-faced person is the most disgusting. I'll boycott you forever," said a Weibo user.

The United States on Friday condemned what it called a "state-led" social media campaign in China against U.S. and other international companies for deciding not to use cotton from China's Xinjiang region over forced labour concerns.

The Chinese foreign ministry did not immediately respond to a Reuters request for comment.

New Balance, Under Armour, Tommy Hilfiger and Converse, owned by Nike, are among companies that have come under fire in China for statements that they would not use cotton produced in the far-western Chinese region due to suspected forced labour.

The United States and other Western countries have imposed sanctions on Chinese officials for human rights abuses in Xinjiang, which the United States has said have amounted to genocide.

"Several companies are starting to cave in to China's threats by removing their forced labour policies from their websites, and even going as far as promoting "Xinjiang Cotton" on their websites, which reports show is tainted with Uighur forced labour," the World Uyghur Congress said in a statement.

"This is the ultimate moral test for these companies: opt for respecting human rights or embolden the genocidal regime of the Chinese Commmunist Party," said the largest group representing exiled ethnic Uighurs.