Wall Street stocks were lower on Tuesday, extending a rough patch for equities amid Federal Reserve monetary tightening and worries over a European energy crunch. About 30 minutes into trading, the Dow Jones Industrial Average was down 0.7 percent at 31,089.28.The broad-based S&P 500 dropped 0.8 percent to 3,893.84, while the tech-rich Nasdaq Composite Index shed 1.1 percent to 11,499.53.