Shedding early gains, the Bombay Stock Exchange (BSE) was trading around 37 points lower in late afternoon trade on Thursday after oil and gas, auto and realty stocks came under intense selling pressure.
The 30-scrip sensitive index, which opened at 17,856.29 points, was ruling at 17,810.05 points, 0.21% or 36.81 points down from its previous day's close at 17,846.86 points.
At one time, it was trading around 100 points higher.
The Sensex touched a high of 17,972.54 points and a low of 17,792.87 points in intra-day trade.
The wider 50-scrip S&P CNX Nifty of the National Stock Exchange was ruling 0.91% down at 5,402.30 points.
The BSE oil and gas index was down 138.07 points followed by the auto index, down 79.11 points and the realty index, down 10.74 points.
The main Sensex losers were RIL, down 2.26% at Rs. 789.75; ONGC, down 1.83% at Rs. 280.90; Tata Motors, down 1.41% at Rs. 244.40; Mahindra and Mahindra, down 1.27% at Rs. 773.85; and Larsen and Toubro, down 1.19% at Rs. 1,439.45.
The major Sensex gainers were Wipro, up 2.82% at Rs. 364.20; TCS, up 1.71% at Rs. 1,314.10; Infosys, up 1.44% at Rs. 2,464.50; Tata Steel, up 1.32% at Rs. 397.80; and Hindustan Unilever, up 1.24% at Rs. 517.90.
Among other Asian markets, Japan's Nikkei was up 0.51% while Shanghai's composite index was trading 0.25% higher. Hong Kong's Hang Seng was up 1.23%.