The BSE Sensex on Tuesday dropped from a two-week high, as investors awaited the outcome of the US central bank‘s meeting later this week. The Sensex fell 150 points to 25,705.93, 0.6 per cent lower after earlier gaining as much as 0.2 per cent. The National Stock Exchange’s Nifty ended down 0.6 per cent after rising 0.1 per cent.