Wall Street falls on North Korea nuclear test, U.S. rate hike worry

U.S. stocks dropped on Friday as investors were rattled by a nuclear test by North Korea and comments by Federal Reserve officials that hinted at a U.S. interest rate hike, putting the S&P 500 on pace for its worst day in over two months. North Korea conducted its fifth and biggest nuclear test on Friday and said it had mastered the ability to mount a warhead on a ballistic missile, drawing condemnation from the United States as well as China, Pyongyang's main ally. There was further pressur