(Reuters) - U.S. stocks ended sharply lower on Friday, with the Dow and S&P 500 posting their worst weekly performances in months, after comments from Federal Reserve official James Bullard that the U.S. central bank might raise interest rates sooner than previously expected spooked investors.
(Reuters) - Weakness in tech shares pulled Wall Street lower at the open on Thursday after the Federal Reserve signaled it could start tapering its stimulus earlier than expected, piling pressure on a sector that is seen as vulnerable to higher interest rates.