"It is unacceptable the way Iran is behaving. And if it does not come into compliance, then the matter is going to be referred to the United Nations Security Council," said White House spokesman Scott McClellan.

His comments came before Iran threatened to cease application of the additional protocol to allow nuclear inspections if the UN nuclear watchdog pursued a resolution which could take Iran before the UN Security Council.

McClellan, referring to that International Atomic Energy Agency resolution, said: "The world is saying to Iran that it is time to come clean. The world has put Iran on notice with this resolution.

"That was clearly stated in the resolution that was passed. The resolution reflects the international community's deep concern about Iran's pattern of deception and concealment. And we will not tolerate it," he said.

"We continue to support the diplomatic efforts of the Europeans to resolve this matter," he told reporters. "There is a growing majority of nations that recognize Iran's noncompliance must be addressed.

"And if they continue to fail to comply with their international obligations, then the matter is going to the United Nations Security Council," said the spokesman.

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