Stock market today: The BSE Sensex ended the session down 324.17 points, or 0.39 percent, at 83,246.18, after sliding as much as 672.04 points, or 0.80 percent, intraday to 82,898.31. The NSE Nifty fell 108.85 points, or 0.42 percent, to close at 25,585.50.