The former Khmer Rouge foreign minister and his wife have been formally charged by Cambodia's U.N.-assisted genocide tribunal, the court announced Tuesday. Ieng Sary and his wife, Ieng Thirith, had been arrested Monday at their home in the Cambodian capital Phnom Penh. The tribunal's announcement, dated Monday but released Tuesday afternoon, said Ieng Sary had been charged with crimes against humanity and war crimes and his wife _ who was social affairs minister in the 1970s Khmer Rouge regime _ with crimes against humanity, the Associated Press reported. The announcement also said that a hearing to decide whether they should be held in pre-trial detention had been delayed until Wednesday at the defendants' request so they could prepare a defense. It said they would be held in police custody instead of by the tribunal.