The 30-share BSE Sensex declined abruptly post noon, reflecting heavy fluctuations, wiping out all its early gains. It tanked 454.69 points or 0.62 per cent to settle at 72,488.99. During the day, it gyrated 1,107.38 points between the day's high and low. The NSE Nifty declined 152.05 points or 0.69 per cent to 21,995.85. It hit a high of 22,326.50 and a low of 21,961.70 during the day.