Sensex tumbles 871 points; Nifty tanks below 14,650

After plunging over 1,400 points earlier in the day, the 30-share BSE index pared some losses to finish at 49,159.32, down 870.51 points or 1.74 per cent. Similarly, the broader NSE Nifty sank 229.55 points or 1.54 per cent to 14,637.80.