U.S. stocks fell sharply on Friday, with the Dow Jones industrial average dropping as much as 538 points, as Britain's vote to quit the European Union sent a shock wave through global financial markets.
The S&P 500 index and Dow were on track for their biggest one-day percentage drop since September, while the Nasdaq composite index was headed for its worst day since August. All three indexes were set for their second weekly decline in a row.
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