The Sensex is flat at 16,674 - down four points.The NSE Nifty is down four points at 4,949.The index has rebounded into the positive zone and is now up 42 points at 16,720.Larsen & Toubro has slumped 2.5% to Rs 3,260. Bharti Airtel and Reliance Communications have dropped over 2% each to Rs 773 and Rs 531, respectively.BHEL has shed 1.4% at Rs 2,070. Wipro and Hindustan Unilever have slipped 1.2% each to Rs 415 and Rs 229, respectively.HDFC Bank and Grasim are down 1% each at Rs 1,377 and Rs 2,754, respectively.HDFC has soared nearly 3% to Rs 2,645. Ranbaxy and Reliance Energy have surged around 2% each to Rs 460 and Rs 1,514, respectively.Maruti has rallied 1.8% to Rs 890, and Mahindra & Mahindra has added 1.6% to Rs 695.TCS and Tata Motors have gained 1.3% each at Rs 856 and Rs 702, respectively.Reliance is up 1% at Rs 2,328.