After gaining over 46 points in the opening trade, the BSE benchmark Sensex was trading at 17,212 in the first five minutes of trade today. But in later session, Sensex lost over 99 points and was trading at 17,066 points a short while ago. While 50-share National Stock exchange, Nifty was dangling 32 points down at 5,121 amid volatility.The Indian rupee fell by 17 paise to a one-year low of Rs 46.36 per US dollar in early trade on the Interbank Foreign Exchange today as the American currency firmed up against other major rivals overseas.