The BSE benchmark Sensex gained over 125 points in opening trade today, extending yesterday's gains on continued foreign capital inflows amid a firming trend overseas. The 30-share index rose 0.74 percent, to 17,084 on the back of strengthening banking, auto, IT and consumer durable stocks. The index had gained 421 points in the previous session. In a similar fashion, the wide-based National Stock Exchange Nifty index moved up by 37 points, or 0.73 per cent, to 5,136 in opening trade. In the Asian region, Hong Kong's Hang Seng Index gained 1.66 per cent, while Japan's Nikkei was up 1.15 per cent per cent in morning trade. The US Dow Jones Industrial Average closed 0.90 per cent higher yesterday.