The United States’ customs agency blocked a shipment of Fast Retailing Co.’s Uniqlo shirts in January for violating an order prohibiting imports of items suspected to be produced by forced labor from China’s state-owned Xinjiang Production and Construction Corps.

The blockage of Uniqlo’s cotton men’s shirts, which happened at the Port of Los Angeles, was revealed in a U.S. Customs and Border Protection document dated May 10 in which the agency denied an appeal by Uniqlo to release the shirts. Uniqlo is the main brand of Asia’s largest apparel retailer, Fast Retailing, and founded by Tadashi Yanai.

The U.S. customs document notes that Uniqlo had argued and provided proof that the raw cotton used to produce the shirts didn’t originate from Xinjiang Production and Construction Corps. Still, Uniqlo failed to provide enough information to establish the items were not produced in part by forced labor in China’s far west Xinjiang region, according to the customs agency.

A representative for Fast Retailing couldn’t immediately comment on the document.

It is not clear if the U.S. has blocked other shipments from Uniqlo or other brands under the order issued by then-U.S. President Donald Trump’s administration in December. A search of previous rulings from U.S. customs showed no other documents related to the recent actions to prohibit Xinjiang cotton.

Global apparel-makers have been caught up this year in the controversy surrounding cotton sourced from Xinjiang, with Chinese consumers boycotting foreign brands critical of China’s actions and Western governments like the U.S. cracking down on items sourced from the region. The geopolitical turmoil has added uncertainty for apparel companies that had been betting on China to fuel future growth.

The U.S., European Union and United Kingdom have placed sanctions on Chinese officials and goods over alleged human rights abuses against Uyghurs in Xinjiang, which U.S. President Joe Biden’s administration has said amounts to genocide. China denies any forced labor, calling it the “biggest lie of the century,” and says its policies are lifting the region out of poverty, boosting the economy and countering extremism.

Uniqlo hasn’t been a key target of boycotts in China compared to rivals such as Hennes & Mauritz AB. Yanai, who is also Fast Retailing’s chief executive officer, has repeatedly declined to comment on Xinjiang, saying the company doesn’t involve itself in political issues.

There were 47 Uniqlo stores in the U.S. as of April. Fast Retailing has about 809 Uniqlo stores in mainland China, which make up about a fifth of revenue for the company.

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