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(CNN Business) —  

Apple is feeding some of Wall Street’s biggest fears.

The Dow dropped 660 points, or 2.8%, on Thursday after Apple warned it will badly miss its quarterly sales forecast because of weakening growth and trade tensions in China.

Apple (AAPL), among the world’s most widely held stocks, plummeted 10% in its darkest day in six years. The former king of the stock market fell to the fourth-biggest public company, behind Amazon (AMZN), Microsoft (MSFT) and Alphabet (GOOGL).

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