U.S. stocks opened sharply lower Wednesday as a renewed rout in oil prices and global equities triggered a selloff on Wall Street. The S&P 500 opened 21 points, or 1.1%, lower at 1,860. The Dow Jones Industrial Average dropped 186 points, or 1.1%, to 15,835. Meanwhile, the Nasdaq Composite began the day down 67 points, or 1.5%, at 4,411.
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