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.

Two US lawmakers are urging tighter export controls on Nvidia's AI chips, fearing China's growing AI capabilities. Their concerns stem from reports that a Chinese firm used these chips — currently outside the scope of U.