The Sensex, at the Bombay Stock Exchange slipped 159 points or 0.8 percent to 20,340, in the afternoon trade, on Wednesday. The Nifty of the National Stock Exchange lost 57 points or 0.9 percent to trade at 6,090. Other stock markets in Asia were trading mixed in intra-day trade on Wednesday. Stocks in Japan, China and South Korea were trading lower between 0.1 and 0.5 percent, while Hong Kong gained 0.3 percent and Singapore added 0.4 percent.