U.S. stocks erased earlier gains and turned lower after the Federal Reserve left its key borrowing rate unchanged. The S&P 500 is down 5 points, or 0.3%, at 1,990. The Dow Jones Industrial Average dropped 49 points, or 0.3%, to 16,693. The Nasdaq Composite lost 5 points, or 0.1% to 4,887.
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