U.S. stocks nosedive as tech saps rally, slashing more than 800 points off Dow

Investors slammed the brakes on a record-shattering run that repeatedly lifted the Standard & Poor’s 500 and Nasdaq composite to new heights and pulled the Dow Jones industrial average within reach of its own record high. All three indexes shed at least 2.8 percent, dragged down by Apple, Microsoft, Amazon and other technology stocks.