THE U.S. government has asked South Korea to arrest a brother of former U.N. Secretary-General Ban Ki-moon on charges that he engaged in a bribery scheme to carry out the sale of a Vietnamese building complex, a U.S. prosecutor said on Friday. During a court hearing in federal court in Manhattan, Assistant U.S. Attorney Daniel Noble said that a request had been made for the arrest of Ban Ki-sang, who was an executive at South Korean construction firm Keangnam Enterprises Co Ltd. South Korea’s Justice Ministry was discussing the request to arrest Ban but “it is not yet a formal consultation,” Yonhap news agency quoted an unnamed source in the country’s judiciary as saying.