The 30-share index has seen an erosion of 1,326 points, since Tuesday, when the Reserve Bank had cut repo rate by 25 bps, despite flagging concerns over economic recovery.
On the same day, the Met department had forecast monsoon to be deficient this year, triggering drought fears.
The 50-share NSE Nifty continued its slide for the sixth session and dipped below the psychological 8,100-mark by tumbling 70.55 points or 0.87 per cent to close at 8,044.15.
The US posted a better-than-expected jobs data on Friday raising fears that the Federal Reserve was on track to raise interest rates this year.
Sensex, after opening higher at 26,814.31, advanced to touch the day's high of 26,827.05 on value-buying in recently beaten blue-chip stocks.
However, it slipped into the negative zone on emergence of profit-booking and touched a low of 26,472.87 before settling 245.40 points or 0.92 per cent down at 26,523.09, a level last seen on October 20, 2014.
Sectorally, the BSE consumer durables index suffered the most by falling 1.94 per cent, followed by metal (1.73 pc), oil&Gas (1.55 pc), FMCG (1.52 pc) and healthcare (1.17 pc).
Meanwhile, China's indices rose around 2 per cent today ahead of MSCI's decision whether to increase weightage of Chinese shares in Emerging Markets Index.
The move may hit Indian markets as foreign funds may look to redeploy their capital in China, traders said.
Foreign investors sold shares worth Rs 550.29 crore on last Friday as per the provisional data.
"Continued selling by foreign portfolio investors in Indian market and concern of shift of their interest from Indian markets to Chinese market created an alarming signal in the mindset of the investors," said Gaurav Jain, Director of Hem Securities.
