Stock Market: Sensex tumbles 440 points, Nifty to end at 19,660

Key domestic benchmark closed with losses of more than half a percent. The BSE Sensex tumbled 440 points, or 0.66 percent, to finish at 66,267. Similarly, the Nifty 50 at the National Stock Exchange fell 118 points, or 0.60 percent, to end at 19,660.