Director General of the International Atomic Energy Agency (IAEA) Yukiya Amano on Thursday reiterated his call for Tehran to remove the ambiguities shrouding its nuclear program. In his latest report on the international inspections, Amano accused Iran of failure to cooperate with the inspectors of the UN nuclear watchdog and barred them from entering the Parchin military site, a suspected underground nuclear facility. The report, issued by the agency here, claims that Iran resumed installing advanced uranium enrichment centrifuges at the Natanz nuclear plant. It notes that the Iranian behavior undermines seriously the Agency\'s ability to verify that Iran\'s nuclear program is free from military dimensions and consistent with the NPT. As Iran failed to address the concerns of the international community over its nuclear program, the Agency and its director general cannot proclaim that the program is purely civilian and peaceful, according to the report The report comes few days ahead of the nuclear talks between Iran and the P-5 plus one (the five permanent members of the UN Security Council and Germany), due in Kazakhstan on Tuesday.