"It was an irresponsible step. I realise that today. "There was insider trading and an investigation is under way," Deby, who has ruled the poverty-stricken nation since 1990, said of a 2013 deal which saw Glencore acquire 100 percent of the Chad state's stake in its oil business - equivalent to 16 percent of GDP for one of the world's poorest countries.
He said state lawyers were looking into the terms of the deal. NGOs have been critical of links between foreign business and the oil trade in African states, suggesting that the cash flowing from deals in a lucrative sector does not trickle down to society. On Saturday, the SwissAid NGO said it had removed from its website a critical report published on June 12 into Glencore activities in Chad, which became an oil exporter in 2003. SwissAid said it took the move on security grounds after N'Djamena charged that the report, which criticised a lack of transparency in Glencore dealings in the country, was harmful to Chad's image.