Prosecutors have charged relatives of former UN Secretary General Ban Ki-moon with conspiracy to bribe a government official, BBC reports.
Mr Ban's younger brother and his nephew stand accused of offering money to a Middle Eastern official, through an American middleman.
They allege the two men bribed the official to use state funds to buy their building project.
Mr Ban served as UN secretary general from 2007 until 2016.
He was succeeded by former Portuguese Prime Minister Antonio Guterres on 1 January 2017. Mr Ban is now being seen as a possible future president in his home country of South Korea.
Reuters quoted his spokesman as saying Mr Ban was unaware of the circumstances surrounding the allegations against his relatives.