demand for the American currency and strengthening of the dollar against its rivals overseas. Forex dealers said in addition to continued demand for the American currency from importers and some banks, dollar gains against the euro and other currencies amid concerns over the euro zone debt crisis put pressure on the Indian rupee. Meanwhile, the BSE benchmark Sensex fell by 158.51 points, or 1%, to 15,722.63 in opening trade on Thursday.Source: News Bullet