The Bombay Stock Exchange benchmark Sensex on Thursday opened 60 points lower as investors sold stocks following weak Asian markets. The 30-share index moved down by 60.38 points, or 0.33 per cent, to 17,916.85 points.The wide-based National Stock Exchange index Nifty fell by 25.40 points, or 0.47 per cent, to 5,373.95 points.The Hong Kong's Hang Seng index was down 0.14 per cent, while the Japanese fell 0.70 per cent in the morning trade on Thursday. The US Dow Jones Industrial Average ended 1.07 per cent down in Wednesday's trade.