The Sensex is now down 171 points at 10,688.ONGC has rebounded into positive zone and is the sole gainer among the index stocks.Hindalco has dropped 3.5% to Rs 176. Reliance Communications, Tata Motors and Dr.Reddy's have slipped around 3% each to Rs 260, Rs 747 and Rs 1,296, respectively.Grasim, Maruti and Wipro have declined around 2.5% each to Rs 1,983, Rs 794 and Rs 491, respectively.The market breadth is extremely negative - out of 1,295 stocks traded so far, 903 have declined, 357 have advanced and 35 are unchanged.