The Bombay Stock Exchange benchmark Sensex fell by over 88 points in opening trade today. The Sensex was trading at 17005, down by 82 points when reports last came in. Similarly National Stock Exchange index Nifty declined by 23 points to 5101. Brokers said selling pressure continued for the fourth day with European as well as Asian markets remaining shaky. Meanwhile, Japan's Nikkei dropped 2.11 per cent while Hong Kong's Hang Seng index by 0.69 per cent in early trade. The US Dow Jones declined by 0.54 per cent yesterday.