(Bloomberg) -- U.S. stocks plunged the most in 10 months, joining a selloff in global risk assets on speculation that the U.K. decision to leave the European Union will hamper worldwide growth.

Equities sank to session lows in afternoon trading, with the Dow Jones sliding more than 600 points. The S&P 500 extended losses after falling below the 2,050 level, an area where other pullbacks during the prior two months found a floor. Banks and industrial shares capped their worst single-day declines in more than four years.

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