Benchmark indices continue to maintain the dismal trend weighed down by HDFC Group shares, ITC and metal stocks.
At 11:45 AM, the 30-share Sensex was down 142 points at 26,426 and the 50-share Nifty was down 47 points at 7,898.
Growth in services activity picked up pace in September as order books filled up at a faster rate, a business survey showed on Tuesday.