The BSE benchmark Sensex fell nearly 162 points in early trade today. The 30-share barometer has lost over 473 points in the previous three sessions.Similarly, the wide-based National Stock Exchange index Nifty declined 50 points to 4,791.In Asia, the Japan's Nikkei fell by 2.16 per cent, while Hong Kong's Hang Seng shed 1.16 per cent in early trade. The US Dow Jones Industrial Average ended 2.22 per cent lower on Friday.