The Sensex is now down 810 points at 16,768.The NSE Nifty is down 260 points at 4,964.HDFC has slumped 9% to Rs 2,550, and BHEL has plunged over 8% to Rs 2,095.SBI, DLF and ICICI Bank have tumbled over 6.5% each to Rs 1,968, Rs 728 and Rs 1,020, respectively.NTPC has shed 5.7% at Rs 190. Reliance and HDFC Bank have slipped over 5% each to Rs 2,331 and Rs 1,379, respectively.Bharti Airtel and Reliance Communications have dropped around 4.5% each to Rs 790 and Rs 549, respectively.Larsen & Toubro, ITC and Hindalco have declined 4% each to Rs 3,379, Rs 194 and Rs 195, respectively.Maruti has soared 3.7% to Rs 899. Hindustan Unilever has surged 2.5% to Rs 233.Ranbaxy has gained 2.5% at Rs 457, and Cipla has added 2.4% to Rs 211.Out of 2,724 stocks traded so far, 2,286 have declined, 398 have advanced and 40 are unchanged.