The Bombay Stock Exchange benchmark Sensex fell by over 86 points in the opening trade today. The Sensex was trading at 20,152 down by over 68 points a short while ago.Analysts said the fall in Sensex is largely due to continued profit-booking by funds and retail investors. Meanwhile in Asian markets, the Hong Kong's hangSeng index quoted higher by 0.30 per cent, while JapaneseNikkei was marginally up by 0.68 per cent in the morning tradetoday. In the US, Dow Jones Industrial Average had ended 0.05per cent higher in Tuesday's trade.