The BSE Sensex which fell by nearly 33 points in opening trade today was trading 139 points down at 15733.In a similar fashion, the wide-based National Stock Exchange Nifty was trading 51 points down at 4699. Stocks of banking, consumer durables, capital goods and realty sectors were under pressure, pulling the Sensex down.In the Asia region, Hong Kong's Hang Seng index was down by 0.33 per cent and Japan's Nikkei index lost 0.05 per cent in morning trade today. The US Dow Jones Industrial Average ended 0.02 per cent lower in yesterday's trade.