The Sensex has slipped into the negative zone and is now down 17 points at 12,680. Gujarat Ambuja has plunged 5% to Rs 108, and ACC has crashed 4.5% to Rs 816.Wipro has shed 1.7% to Rs 571, and ITC is down 1% at Rs 1,188.Cipla has rallied 3% to Rs 228. Reliance Communications, Larsen & Toubro and Dr.Reddy's have surged over 2% each to Rs 410, Rs 1,460 and Rs 634, respectively.Tata Motors and ICICI Bank are up over 1% each to Rs 736 and Rs 860, respectively.Out of 2,291 stocks traded so far, 1,356 have declined, 873 have advanced and 62 are unchanged.