CAIRO - Egypt's benchmark stock index has fallen more than 3 per cent, dragged down by authorities' decision to ban the chairman of a major private equity firm from travel pending corruption investigations. The Egyptian Exchange's EGX30 index closed 3.4 per cent down on Sunday, its weakest close in more than two weeks. Shares of Citadel Capital, whose chairman Ahmed Heikal was banned from travel on Thursday by the prosecutor general, shed almost 10 per cent to settle at 4.60 Egyptian pounds, according financial data provider Zawya.com. Heikal and former premier Atef Ebeid are the latest in a growing list of businessmen and former regime officials facing investigations on allegations ranging from corruption to profiteering. Heikal has not been officially charged with any crimes.