The S&P 500 hit session lows and the Nasdaq fell to session lows on Thursday, as selling intensified in the last hour of trading.

The Dow Jones industrial average tumbled 469.05 points, or 4.11 percent, to 10,941.16. The Standard & Poor's 500 Index slid 57.15 points, or 4.79 percent, to 1,136.74. The Nasdaq Composite Index lost 136.40 points, or 5.43 percent, to 2,375.08.

(Reporting by Caroline Valetkevitch; Editing by Jan Paschal)