TEHRAN, Sept. 27 (Xinhuanet) -- Iran repeated its "serious warning" on Tuesday that it could resume uranium enrichment and ban tough inspections of its nuclear sites if the UN nuclear watchdog insisted on sending Iran's nuclear case to the UN Security Council.

    "Iran has delivered a serious warning, by which we hope the Europeans and the International Atomic Energy Agency (IAEA) not to remain insistent on but to amend the resolution on Iran's nuclear issue," Foreign Ministry spokesman Hamid-Reza Asefi told weekly news briefing.

    Asefi was referring to the resolution adopted by the IAEA's 35-nation board of governors on Saturday that accused Tehran of breaching nuclear proliferation safeguards and postponed referral of Iran's nuclear case to the UN Security Council to a later date.

    Iran, which has warned to retaliate over referral, said the resolution was unacceptable.

    An Iranian foreign ministry statement on Monday threatened to cancel all its voluntary and temporary concessions, including the implementation of the Additional Protocol of the Non-Proliferation Treaty (NPT) if the IAEA board did not correct its resolution.

    Asefi told reporters that Iran could also end a freeze on uranium enrichment which the United States and the European Union suspect could be used for making atomic bombs but Iran insists is aimed at producing fuel for nuclear power plant.

    The EU, which has been persuading Iran to abandon all nuclear fuel work to prove its nuclear program is purely for peaceful purposes, joined the US call for bringing Tehran before the Security Council for possible sanctions after Iran restarted its uranium conversion work in early August.

    Iran suspended all enrichment related activities last Novemberas confidence building measure before joining talks with the EU.Enditem