The Sensex is now down 830 points at 15,712 on the back of unabated selling.The NSE Nifty is down 240 points at 4,681.Bajaj Auto has slumped 11% to Rs 1,894. Reliance Energy has tumbled 10.5% to Rs 1,306, and ICICI Bank has shed 10% at Rs 865.Hindalco has dropped 7.8% to Rs 192. NTPC, Ranbaxy, Maruti and Tata Motors have slipped over 6% each to Rs 183, Rs 426, Rs 884 and Rs 661, respectively.BHEL has shed 5.5% at Rs 1,970. Satyam, Mahindra & Mahindra and Reliance are down 4% each at Rs 412, Rs 662 and Rs 2,179, respectively.