Audio By Carbonatix
The US Postal Service (USPS) says it has temporarily stopped accepting parcels from mainland China and Hong Kong.
Letters will not be affected by the suspension, according to a statement on the company's website.
It said the suspension will be in place "until further notice" and did not offer any explanation for the decision.
USPS did not immediately reply to a BBC News request for comment.
It comes after Donald Trump imposed an additional 10% tariff on all goods imported to the US from China.
Trump's executive order also eliminated an exemption that allowed goods worth $800 (£474) or less to enter the US without having to pay duties or certain taxes.
The so-called "de minimis" tax loophole faced increased scrutiny in recent years as Chinese e-commerce giants like Shein and Temu to reach millions of US customers.
US officials have pointed out that the large flow of parcels entering the country through this exemption made it increasingly difficult to screen them for possible illegal goods.
USPS did not immediately reply to a BBC News request for comment.
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