The BSE Sensex ended at 20,666, down 0.8 per cent from its previous close. The NSE Nifty also ended the day down 0.8 per cent at 6,140. "Economic data coming in from the US have been good and things are looking better. This could mean that the tapering may start earlier than expected. However, there are conflicting views due to the uncertainty over the debt ceiling issue," said U R Bhat, managing director, Dalton Capital.
Analysts said the withdrawal of the Fed stimulus, known as Quantitative Easing 3 (QE3), could start in December itself if the jobs data showed an improvement as well. Investors were expecting the Fed to start QE3 tapering by March.
The Sensex in the last four sessions has fallen about 2.7 per cent or 573 points. Among the gainers were the beaten-down sectors of realty, capital goods and power.
Foreign institutions were buyers in the net at Rs 412 crore while domestic institutions were net sellers at Rs 915 crore on Friday, according to provisional data.