All the sectors, realty, power, teck, healthcare, consumer durables, IT, capital goods and metals were in the red.
The 30-share index resumed lower at 25,809 and hovered in a range of 25,992.31 and 26,656.90 before quoting 25,951.94 at 1045 hours, showing a fall of 313.30 points or 1.19 per cent.
The NSE 50-share Nifty was also trading down at 98 points, or 1.23 points to 7,856.30 at 1045 hours.
However, Tata Motors rose by 2.03 per cent, followed by Maruti Suzuki 1.92 per cent and SBI 0.72 per cent.
Meanwhile, foreign investors bought shares worth Rs 219.17 crore last Friday.
In overseas market, Asian stocks were mixed, mirroring the weak trend in Wall Street on Friday.