The Sensex, which had gained nearly 696.42 points in the previous three sessions, dropped by 255.69 points, or 1.22 percent, to 20,635.13, after touching a low of 20,579.94.
The 30-share index lost strength in the last 30 minutes weighed down by losses in ICICI Bank, RIL, Infosys, HDFC Bank and L&T. Bharti Airtel and Hindalco were the biggest losers. CIL, Tata Power, Sesa Sterlite and Tata Steel gained.

On similar lines, the broad-based National Stock Exchange index Nifty tumbled by 80.45 points, or 1.30 percent, to end at 6,122.90.It intra-day touched a low of 6,106.95.Also, SX40 index, the flagship index of MCX-SX, closed 155.5 points lower at 12,245.9.
While Fed chief Ben Bernanke yesterday reiterated the US central bank's commitment to easy policy, markets were seen nervous ahead of the release of minutes of Fed's October meeting and data relating to retail sales and pre-owned homes.
"...heavy selling pressure in last hour of trade brought markets to negative territory as global indices were also in red ahead of US Fed meeting," said Nidhi Saraswat, Senior Research Analyst, Bonanza Portfolio Ltd.
The Indian rupee also depericiated by around 25 paise to 62.62/63 per US dollar. Experts attributed the weakness in Asian markets to the Organization for Economic Cooperation and Development (OECD) cutting its forecast for world growth this year to 2.7 percent and 3.6 percent for next.
Sectorally in India, the BSE Banking sector index, which was in lime-light for a few sessions, fell the most by losing 1.76 percent, followed by Consumer Durable index by 1.63 percent, Auto sector index by 1.23 percent and Capital goods index by 1.17 percent.
In the broader markets, sugar stocks, including Balrampur Chini and Bajaj Hindusthan, notched up 10-14 percent gains on hopes of import duty hike.


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