The 30-share barometer slipped below the 27,000-mark by falling 185.55 points, or 0.69 per cent, to 26,875.49 with metal, FMCG, power, capital goods and IT stocks leading the fall.
The index had gained 65.17 points in the previous session on Friday.
On similar lines, the National Stock Exchange index Nifty moved down by 70.95 points, or 0.88 per cent, to trade below the 8,100-mark at 8,034.55.
Brokers said selling activity emerged largely on disappointing economic data as the country's industrial production growth slowed to 4-month low of 0.5 per cent in July but easing retail inflation to 7.8 per cent in August from 7.96 per cent in July, restricted the fall.
Besides, a weak trend on other Asian bourses after data showing Chinese industrial output expanded in August at its slowest rate since the global financial crisis, influenced the sentiments, they said.