Equity futures turned lower Thursday after Canadian authorities arrested the chief financial officer of Chinese telecom giant Huawei at the request of U.S. authorities.

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The blue-chip Dow Jones Industrial Average was poised to open down by more than 400 points.

Global stocks also fell after the arrest Wednesday in Vancouver of Meng Wanzhou, also known as Meng Sabrina, who faces extradition to the United States.

The specific charge or charges against the 46-year-old daughter of Huawei’s founder were not disclosed, but U.S. officials have been investigating the company for possibly violating American trade sanctions against Iran.

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