U.S. stocks opened sharply lower on Friday as fears about global growth resurfaced a day after the Federal Reserve left its key borrowing rate unchanged. The main indexes looked set to erode weekly gains. The S&P 500 fell 18 points, or 0.9%, to 1,972. The Dow Jones Industrial Average dropped 188 points, or 1.1%, to 16,483 at the open. The Nasdaq Composite began the day down 56 points, or 1.1% at 4,838.
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