US STOCKS-Wall St tumbles after N.Korea test, rate hike worry
* North Korea conducts fifth nuclear test
* Fed's Rosengren says increasingly risky to delay hike
* Energy shares fall as oil retreats
* Indexes down: Dow 1.05 pct, S&P 1.22 pct, Nasdaq 1.13 pct (Updates to mid-morning, adds data)
By Chuck Mikolajczak
NEW YORK, Sept 9 (Reuters) - U.S. stocks dropped on Friday as investors were unnerved by a nuclear test by North Korea and comments by a U.S. Federal Reserve official that pointed towards an interest rate hike.
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 pressure on the equity market after Boston Fed President Eric Rosengren, a historically dovish policymaker, said the Federal Reserve increasingly faced risks if it waited too much longer. He said a gradual policy tightening was likely appropriate, although he added the central bank was unlikely to raise rates too rapidly.
"Certainly the posturing of the Fed is creating a lot of noise, and when you get comments like that, it creates a little bit of anxiety in the market," said Phil Blancato, chief executive of Ladenberg Thalmann Asset Management in New York. Continuación...