Tracking Asian markets, the Bombay Stock Exchange benchmark Sensex fell by more than 63 points in early trading on Wednesday on funds selling.
The BSE-30 share Sensex, which had lost 21.40 points on Tuesday, recovered by nearly 27 points to 15,316.75 points but fell back to quote 63.20 points down at 15,226.62 in the first five minutes of trading.
Similarly, the wide-based National Stock Exchange's Nifty was down by 23.50 points at 4,473.25 after rising to 4,504.50 points at the outset.
Stock brokers said reports of weakening Asian markets mainly triggered selling by foreign funds on the domestic bourses.
Major losers were Reliance Industries, ACC, Larsen and Toubro, Maruti Udyog, SBI, Tata Motors, Tata Consultancy Services and HDFC Ltd.