US officials are probing whether Chinese AI startup DeepSeek bought advanced Nvidia Corp. semiconductors through third parties in Singapore, circumventing US restrictions on sales of chips used for artificial intelligence tasks,

Export controls need to be tightened after revelations the Chinese company used Nvidia technology, the leaders of a congressional committee said.

Organised AI chip smuggling to China has been tracked out of countries including Malaysia, Singapore and the United Arab Emirates, the source said. The Commerce Department and DeepSeek did not immediately return requests for comment.

Nvidia shares' 9% recovery Tuesday was the second-best day in terms of market cap added for any company ever—but the company faced another selloff Wednesday.

WASHINGTON (Reuters) -Two members of U.S. Congress are calling on President Donald Trump's administration to consider restricting the export of artificial intelligence chips made by Nvidia, alleging Chinese AI firm DeepSeek has relied on them.