Despite opening with a positive gap of 54 points at 13,704, the index soon tumbled into the negative zone to a low of 13,539. The index is now down 60 points at 13,590.Bajaj Auto, Wipro and ICICI Bank have slipped over 1% each to Rs 2,780, Rs 607 and Rs 897, respectively. SBI and Ranbaxy are up 1% each at Rs 1,100 and Rs 355, respectively.