The benchmark BSE Sensex fell 91 points to 20,760 in early trade today on sustained selling by funds and investors amid a weakening trend in other Asian markets.Similarly, the National Stock Exchange index Nifty shed 34 points to 6,179.In the Asian region, Hong Kong's Hang Seng index shed 0.56 per cent, while Japan's Nikkei fell 2.18 per cent in early trade today.The US Dow Jones Industrial Average ended 0.17 per cent higher in Friday's trade.