The Sensex at the Bombay Stock Exchange lost 128 points, or 0.6 percent, to trade at 20,477, in the afternoon session, a short while ago. The Nifty at the National Stock Exchange fell 41 points, or 0.7 percent, to 6,075.In other Asian markets, key benchmark indices in Japan, China, South Korea and Singapore has been trading mixed, in intra-day trade.