Sentiment took a blow after a private survey showed that India's manufacturing growth dropped to a 22-month low in October to 50.7, from 51.2 in September, said equity brokers.
With today's 97.68-point drop, the 30-share barometer has plunged around 911.66 points in the past six sessions.
The market is on a downward spiral since last Monday on sustained foreign fund outflows and weaker-than-expected earnings by some blue-chips.
Mood suffered another jolt after weak Chinese manufacturing data for October fuelled worries about the health of the world's number two economy.
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The 30-share BSE barometer Sensex shuttled between 26,378.26 and 26,824.30 during the day and finally ended lower by 97.68 points, or 0.37 per cent, at 26,559.15.
This is the lowest closing since October 1.
In June, the BSE benchmark had fallen for six days at a stretch.
With a slump of up to 4.85 per cent, Bajaj Auto was the big loser among Sensex and Nifty stocks today after the company today reported an 8.59 per cent slump in total sales in October.
The country's largest carmaker, Maruti Suzuki, was a bright spot as it climbed 1.05 per cent after the company posted a 29.1 per cent growth in total sales in October.
Shares of M&M, Coal India, RIL, ICICI Bank and Tata Motors too ended in the positive zone.
Sectorwise, the BSE metal index tanked the most, down 1.27 per cent, followed by capital goods, healthcare and power.
In broader markets, the small-cap index shed 0.20 per cent while mid-cap managed to close 0.08 per cent higher.
Overseas, Asian stocks ended down while European markets were trading lower in their morning session.