U.S. stock futures and global indexes plunged, adding new turmoil to a roller-coaster week for markets, as a U.S. travel ban stoked renewed worries about the coronavirus’s economic toll.

S&P 500 futures were down 4%, suggesting U.S. shares could be set for another punishing session later Thursday, a day after the Dow Jones Industrial Average slid into a bear market.

European…

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