The Sensex is now down 206 points at 12,918.HDFC has tumbled over 4% to Rs 1,508. Wipro has shed 3.8% to Rs 564, and Satyam has plunged 3.5% to Rs 456.ICICI Bank, Tata Motors and Hero Honda have dropped around 2.5% each to Rs 853, Rs 735 and Rs 652, respectively.Infosys, TCS and Hindalco have slipped around 2% each to Rs 2,016, Rs 1,238 and Rs 131, respectively.BHEL has moved up 1.3% to Rs 2,283. Ranbaxy and Dr.Reddy's are up 1% each at Rs 332 and Rs 688, respectively.Out of 2,114 stocks traded so far, 1,515 have declined, 540 have advanced and 59 are unchanged.