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The 30-share index, which opened higher by 205 points, tumbled by 582.76 points to 9,998.73 in pre-close trading, a level last seen in June 2006. The wide-based National Stock Exchange index Nifty, which gained 66.65 points at the initial stage, plunged by 196.35 points, or 6 per cent at 3,072.95 points at the same time. Markets have turned volatile after bouncing back in early trade. Buying is seen in technology, capital goods and oil stocks, while selling in banking, few metal, pharma and FMCG stocks. LIVE Sensex - World Market