Wall Street stocks tumbled Wednesday as a September selloff resumed amid worries over a coronavirus second wave and an increasingly contentious US presidential election. At the closing bell, the Dow Jones Industrial Average was down 1.9 percent at 26,764.25. The broad-based S&P 500 dropped 2.4 percent to 3,236.99, while the tech-rich Nasdaq Composite Index shed 3.0 percent to 10,632.99. jmb/cs