Even the NSE Nifty came under pressure and settled below the 8,000-mark.
Mood remained fragile because of uncertainty over Bihar Assembly election results and disappointing quarterly earnings by blue-chips.
Exit polls are due later in the day and results are salted for Sunday.
Also, investors refused to play ball as they digested US Fed Chair Janet Yellen's announcement on Wednesday that a December rate hike is very much on the table as the economy has performed well.
The BSE Sensex after opening a shade higher quickly turned negative and finally settled the day lower 248.72 points, or 0.94 per cent, at 26,304.20 after selling pressure accelerated towards the fag end -- its weakest closing since October 1. The gauge had lost 37.67 points in yesterday's choppy session.
The 50-share NSE Nifty broke below the psychological 8,000-mark by tumbling 84.75 points, or 1.05 per cent, to close at 7,955.45 after shuttling between 8,031.20 and 7,944.10.
Vedanta Ltd was the biggest percentage loser as it plunged 4.66 per cent while Sun Pharma dived 4.28 per cent after its US-listed arm Taro Pharma reported disappointing earnings.
Tata Steel tumbled 4.33 per cent ahead of its quarterly earnings later in the day.
BHEL, Bharti Airtel, GAIL, Cipla and Axis Bank too cut a sorry figure. As many as 23 Sensex stocks fell.
According to provisional data, FPIs bought shares worth Rs 33.16 crore yesterday.
Sector-wise, BSE realty index fell the most by dropping 2.63 per cent, followed by healthcare, banking, technology and IT.
In line with the overall trend, small-cap and mid-cap indices also ended in the red with losses of up to 1.59 per cent.
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