The Sensex, which had ended at record closing of 21,239.36 in the special Diwali 'Muhurat' trading on Sunday, fell sharply by 264.57 points, or 1.25 per cent, to close at 20,974.79 led by stocks of FMCG, Healthcare and IT sectors.
In the previous five sessions, the 30-share Sensex rose by 669 points. Today's fall in absolute terms is the worst since September 30 when it had dropped by 347.50 points.
Also, SX40 index, the flagship index of MCX-SX, closed at 12,494.1, down 105.43 points or 0.84 per cent.
"Profit booking after several sessions of gains led to the fall. Global indices were also trading on a cautious note," said Rakesh Goyal, Senior Vice President, Bonanza Portfolio Ltd.
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Brokers said a weakening trend in Asia and lower opening in Europe on growth concerns further fuelled the selling pressure in export-oriented domestic stocks.
Sectorally, the BSE FMCG sector suffered the most by losing 2.53 per cent, followed by BSE Healthcare index by 1.55 per cent, BSE IT sector index by 1.28 per cent and BSE TECK index by 1.25 per cent.