The Sensex is now down 177 points at 15,910.The NSE Nifty is down 33 points at 4,796.Tata Motors has plunged nearly 6% to Rs 640, and Satyam has tumbled nearly 4% to Rs 397.Infosys has shed 2.6% at Rs 1,457. Jaiprakash Associates has dropped 2.3% to Rs 221.Reliance, Reliance Communications and Larsen & Toubro have slipped around 2% each to Rs 2,252, Rs 515 and Rs 2,988, respectively.TCS and ICICI Bank have declined 1.7% each to Rs 864 and Rs 829, respectively.SBI, Reliance Energy, HDFC Bank and HDFC are down around 1.5% each at Rs 1,687, Rs 1,278, Rs 1,420 and Rs 2,623, respectively.Hindalco has surged 5.3% to Rs 171. ITC and Cipla have moved up around 2% each to Rs 199 and Rs 209, respectively.Ambuja Cements has gained 1.5% at Rs 124.