Extending its gains for the third straight session, the Sensex at the Bombay Stock Exchange jumped 130 points, or 0.7 percent, to close at a fresh one-week high of 20,161, amid rising Asian and European markets, today. The Nifty at the National Stock Exchange gained 28 points or 0.5 percent, to 6,111.Stock markets in Japan, China, Hong Kong, South Korea and Singapore climbed between 0.3 percent and 1.2 percent.