The S&P 500 sank 1.7% for its worst day in two months. The Dow Jones Industrial Average dropped 748 points, or 1.7%, and the Nasdaq composite tumbled 2.2%.
Stock indexes sold off sharply Friday, with the S&P 500 and Nasdaq 100 sliding to 1-week lows and the Dow Jones Industrials falling to a 1-month low.  Stocks opened lower on negative corporate news as ...