Sensex on Monday tumbled 705.65 points to 81,702.52; Nifty dropped 182.85 points to 24,929.55 in early trade.
Equity benchmark indices Sensex and Nifty rebounded sharply by over 1 per cent on Friday after sliding for the past three sessions, propelled by bargain hunting in financial, telecom and tech stocks amid a correction in global crude prices.