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NEW YORK, Sept 22 (Reuters) - U.S. stocks dropped on Tuesday, dragged down by investor uncertainty over when the Federal Reserve will raise interest rates and as a selloff in commodities pushed materials shares lower.
The Dow Jones industrial average fell 179.92 points, or 1.09 percent, to 16,330.27, the S&P 500 lost 24.25 points, or 1.23 percent, to 1,942.72 and the Nasdaq Composite dropped 72.23 points, or 1.5 percent, to 4,756.72. (Reporting by Chuck Mikolajczak; Editing by Nick Zieminski)