The Indian equity benchmarks fell for third session in a row on Thursday mirroring losses in global markets as sentiment was shaken after details from last month's meeting of Federal Reserve policymakers showed the central bank intends to be aggressive in its efforts to fight inflation. Meanwhile, investors shifted their focus to RBI's monetary policy decision due tomorrow amid rising inflationary pressure. The Sensex fell as much as 633 points and Nifty 50 index touched an intraday low of 17,623.