S&p 500 Unofficially Closes down 18.82 Pts, or 1.59 Pct, at 1,165.89

Dow Unofficially Closes down 163.63 Pts, or 1.47 Pct, at 10,980.06

Fed's Bernanke Makes No Comment on Outlook for Economy, Monetary Policy in Brief Remarks at Education Event

Venezuela's Pdvsa Reports 2010 First Half Net Profit $2.696 Bln Vs $3.151 Bln Same Period 2009

Us Stocks Slide more Than 2 Pct in Late Afternoon Trade