MUMBAI, SEPT 15: Pivotals suffered further setback on the Bombay Stock Exchange (BSE) today on allround selling pushing down the Sensex by another 70 points. Resuming steady, share prices reacted as the session progressed due to fresh selling from speculators as well as domestic institutions.Sensex (BSE Sensitive Index) opened marginally up at 4739.26 but later dropped to close at 4661.04 with a sizeable loss of 70.08 points against yesterday's close of 4731.12. The BSE-100 index lost further by 20.77 points to 2123.52 from previous close of 2144.29.Brokers said speculators turned cautious and preferred to gradually wind up long positions with first two phases of the general elections completed without any clear indication of the political stability at the Centre. FIIs were net buyers in software shares like Satyam Computer, Infosys, NIIT, Zee Telefilms, Digital Equipment and others. Specified scrips like HPCL, Tata Elexsi, BHEL and Ashok Leyland were locked in the downward circuit filter afterexhausting the daily price limit.Satyam Computer clocked the highest turnover of Rs 208.22 crore of the total volume of business of Rs 1756.45 crore remarkably lower than Rs 2031.84 crore posted yesterday. The market leader Satyam Computer gained by Rs 29.70 to Rs 926.20 on fresh buying support. Zee Telefilms shot up by Rs 171.05 to Rs 3630.25, Dig Equipment by Rs 19 to Rs 668 and Hindustan Lever by Rs 9.65 to Rs 2550.15. However, Reliance lost by Rs 6.50 to Rs 189.75, Ranbaxy by Rs 17.05 to Rs 1040.95, ITC by Rs 24.90 to Rs 945.10, SBI by Rs 2.40 to Rs 221, TELCO by Rs 3.95 to Rs 302.55.