The Indian equity benchmarks resumed their down move after a day's pause in the previous session as investors lightened their positions ahead of corporate earnings which will begin today with Tata Consultancy Services amid weak global cues. The Sensex fell as much as 553 points and Nifty 50 index touched an intraday low of 17,650 dragged by losses Infosys, HDFC Bank, Larsen & Toubro, HDFC, HCL Technologies and Axis Bank.