The Indian equity benchmarks fell for fourth session in a row on Friday dragged down by losses in Infosys, Bajaj Finserv, Larsen & Toubro, Bharti Airtel, Larsen & Toubro and Tech Mahindra. The Sensex fell as much as 844 points at the day's lowest level and Nifty 50 index touched an intraday low of 17,485. Continuous selling by foreign institutional investors is dragging the markets lower, analysts said. In the last four trading sessions, the Sensex has declined 3.7 per cent and Nifty 50 index has dropped 3.77 per cent, data from stock exchanges showed.