The Sensex, which had lost 417 points in the past three sessions, fell further by 156.62 points, or 0.75 per cent to 20,666.15, after touching the day's low of 20,600.90. In the 30-share index, 21 stocks like SBI, ICICI Bank, ONGC, Coal India, Airtel, ITC, Infosys and Sun Pharma ended in red.
Brokers said the market, which is worried about economic slowdown, remained under pressure as the rupee dropped to a six-week low of 62.75 versus dollar, raising concerns about inflation which may force RBI to look at hiking rates again.
For the week ended November 8, Sensex fell by 531 points or 2.5 per cent -- the biggest such drop since the week ended September 27 when it slid down 567 points or 2.65 per cent.
The broad-based National Stock Exchange index Nifty fell by 46.50 points, or 0.75 per cent, to end at 6,140.75 led by banking and interest-sensitive stocks. Also, the SX40 index of MCX-SX fell 119.6 points to end at 12,273.64.