Wall Street slides after shock Brexit vote

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 roiled global financial markets. The S&P 500 index and the Dow posted their biggest intraday losses in more than five months and the Nasdaq staged its biggest intraday drop in more than four months before clawing back some ground in late morning trading. "Investors are shooting first and will ask questions later." At 11:12 a.m. ET (1512 GMT) t