The Sensex is now down 165 points at 15,630.ACC has slumped 5.8% to Rs 1,053. Satyam and Ambuja Cements have plunged over 5% each to Rs 490 and Rs 127, respectively.Bajaj Auto has tumbled 4% to Rs 2,350. Larsen & Toubro has shed 3.5% to Rs 2,572. BHEL has slipped 2.7% to Rs 1,785. Tata Motors and Grasim have declined 2.5% each to Rs 729 and Rs 2,950, respectively.Mahindra & Mahindra and Tata Steel are down 2% each at Rs 780 and Rs 706, respectively.ITC has zoomed 8% to Rs 165. NTPC has surged 3% to Rs 169.ONGC has gained 1.5% at Rs 929. Hindustan Unilever and Bharti Airtel are up over 1% each to Rs 202 and Rs 942, respectively.Out of 2,658 stocks traded so far, 1,861 have declined, 745 have advanced and 52 are unchanged.