The BSE benchmark, Sensex was trading at 20,005 points, up by 155 points when reports last came in. Earlier, the stock markets opened 234 points up and had reached the 20,084 level in first five minutes of trading. The wide-based National Stock Exchange, Nifty was trading at 6,002 points, up by 41 points a short while ago.In other Asian markets, Hong Kong's Hang Seng Index and Japan's Nikkei Index were up by 1.13 per cent and 1.78 percent, respectively in opening trade. In the US, the Dow Jones Industrial Index ended 2.27 per cent high than its previous close.