The Indian equity benchmarks fell for fifth straight session on Tuesday dragged down by losses in index heavyweights like HDFC, HDFC Bank, Infosys, ITC, Tata Consultancy Services, Kotak Mahindra Bank and Hindustan Unilever. For most part of the day, benchmarks traded in a rangebound manner but selling pressure intensified in the last hour of trade with HDFC, HDFC Bank and Infosys adding nearly 600 points towards fall in the Sensex.