Tech stocks pull market sharply lower, erasing early gains

A steep, late-afternoon sell-off in technology companies pulled U.S. stocks sharply lower Tuesday, knocking 344 points off the Dow Jones industrial average.

The market slide erased modest gains from earlier in the day and much of a powerful rally from the day before.

Banks also weighed on the market as bond yields declined. Investors bid up shares in safe-play stocks like utilities and real estate...