HONG KONG — China said on Tuesday that it would begin banning the export of several rare minerals to the United States, an escalation of the tech war between the world’s two biggest powers. The move comes a day after the Biden administration tightened Chinese access to advanced American technology.

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China has banned exports of some rare minerals to the United States as tensions over trade heat up after the U.S. issued new restrictions on exports of certain semiconductor chips and equipment to China earlier this week.