The Sensex opened with a positive gap of 60 points at 18,199, which also turned out to be the high for the day.The index plunged to a low of 17,492 in late noon deals - an intra-day decline of nearly 650 points from the previous close.The Sensex finally closed with a loss of over 600 points (3.4%) at 17,527.The NSE Nifty closed with a loss of 190 points (3.6%) at 5,133.The BSE market breadth was extremely negative - out of 2,849 scrips traded, over 2,000 declined today.INDEX LOSERS...Reliance declined nearly 5% to Rs 2,425.ICICI Bank dropped over 4% to Rs 1,105. L&T slipped nearly 4% to Rs 3,630. Bharti was down 4% at Rs 862.Infosys declined 2% to Rs 1,481. Satyam dropped 4% to Rs 391. TCS and Wipro also closed on a weak note today....AND THE SOLE GAINERACC moved up 1% to Rs 773.MOST ACTIVE COUNTERSRNRL was the most active counter with a turnover of Rs 569 crore followed by REL (Rs 338 crore), RPL (Rs 296 crore), Reliance (Rs 243 crore) and Fututre Capital (Rs 211 crore).