The Indian equity benchmarks moved sharply lower on Monday on the back of a broad-based selling pressure amid weak global markets. The Sensex fell as much as 826 points and Nifty 50 index briefly moved below its important psychological level of 17,100. HDFC Bank, Reliance Industries, HDFC, Hindustan Unilever, ICICI Bank, Infosys and ITC were among the top drags on the Sensex.