Weak earnings from American bellwethers Caterpillar and Boeing propelled a slide on Wall St. when trading activities opened Wednesday. The weak earnings, pronounced concerns over slowing global growth. Data from the American bourse showed the Dow Jones Industrial Average fell 86.95 points, or 0.32%, at the open to 27,262.24. The S&P 500 opened lower by 6.70 points, or 0.22%, at 2,998.77. While the Nasdaq Composite dropped 24.04 points, or 0.29%, to 8,227.36 at the opening bell.