Rising for the third straight session, the Sensex at the Bombay Stock Exchange gained 161 points, or 0.8 percent, to close at a two-week high of 19,414, amid positive European markets, today. The Nifty at the National Stock Exchange rose 45 points, or 0.8 percent, to 5,863.Stock markets in Japan, China, Hong Kong, South Korea and Singapore ended mixed.