U.S. stocks opened sharply lower on Thursday, as another trading halt in Chinese shares and sliding oil prices fueled heavy selling on Wall Street. The S&P 500 opened 24 points, or 1.2%, lower at 1,970. The Dow Jones Industrial Average dropped 225 points, or 1.3%, to 16,676. Meanwhile, the Nasdaq Composite began the day down 102 points, or 2.1%, at 4,734.
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