Wall St lower on weak data, slump in oil prices

Wall Street was lower on the first trading day in August as oil prices touched a six-month low and data showed U.S. economy lost some momentum at the end of the second quarter. Oil prices hit six-month lows earlier in the day, knocked by fresh evidence of growing oversupply and data highlighting slowing demand in China, leaving crude prices on course for their weakest third-quarter performance since the financial crisis in 2008.