The Indian equity benchmarks edged lower on Thursday ahead of weekly expiry of index futures and option contracts amid weak global cues. The Sensex fell as much as 247 points and Nifty 50 index dropped below its important psychological level of 17,100. Tata Consultancy Services, Reliance Industries, HDFC Bank, Wipro, HDFC, Infosys and ICICI Bank were among the top drags on the Sensex.