The technology sector fell amid fears that trade negotiations between the U.S. and China could unravel without yielding a deal.
President Donald Trump said he was happy to wait until after the 2020 presidential election to pursue a long-awaited trade agreement.
Salesforce.com fell slightly after hours in the wake of the business software maker's fiscal third-quarter earnings report.
Sundar Pichai will replace co-founder Larry Page as chief executive of Google parent Alphabet, the company said.
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