'Iran has a case to answer' on nuclear issues: IAEA chief The newly re-elected director general of the UN's IAEA, Yukiya Amano, said on Monday he's unable to speculate "when and if North Korea will conduct another nuclear test." He also said that Iran "has a case to answer" regarding its nuclear activities, and that the IAEA is determinded to reach a solution through diplomatic means. Images and soundbites.