The IAEA report was released to the 35-nation IAEA board and the U.N. Security Council, which has already imposed three sets of sanctions on Iran over its nuclear defiance.
The document said Iran has now amassed a third of the amount of enriched uranium it could reprocess into the material for the fissile core of a nuclear weapon should it choose to do so. But U.N officials familiar with the report emphasized that Iran - whose known nuclear programs are under IAEA supervision - has shown no indication it wanted to go that route.
"We've arrived at a gridlock," said a senior U.N. official, describing the document as "a progress report without progress." He demanded anonymity because he was not authorized to discuss the restricted report.
The United States and its allies allege Iran wants to develop its uranium enrichment program to make nuclear weapons. But oil-rich Iran insists it only wants to make nuclear fuel and IAEA oversight and inspections of its known enrichment program has not come up with any evidence that contradicts that.
The report confirmed Iran continues to expand its uranium enrichment program in defiance of the three sets of U.N. sanctions.
The document said Iran was now either fully or partially operating nearly 4,000 centrifuges at its cavernous underground facility at Natanz. Beyond those machines, which spin uranium gas into enriched uranium, it was testing 12 more advanced prototypes at its above-ground experimental site at Natanz, a city about 300 miles south of Tehran.
Running smoothly, 3,000 centrifuges could enrich enough nuclear material for a bomb over an 18-month period. To do that, however, Iran would have to reconfigure its centrifuge setups - something it could not do under the radar of IAEA inspectors at the scene. Its centrifuges also would have to operate without the mechanical and other problems the Iranian enrichment program has experienced.
To date, Iran had produced about 1,000 pounds of low enriched uranium suitable for nuclear fuel, said the report.
Asked to put that figure into context, U.N. officials said Iran would need three times that amount before being able to start the period of enrichment that could lead to enough nuclear material to produce a nuclear weapon.
In Washington, the White House threatened more sanctions if Iran continues to defy the U.N.
"This report shows once again that Iran is refusing to cooperate with the international community," said White House spokesman Gordon Johndroe. "The Iranian regime's continued defiance only further isolates the Iranian people. We urge Iran to suspend its uranium enrichment and reprocessing activities or face further implementation of the existing United Nations Security Council sanctions and the possibility of new sanctions."
Germany's Foreign Minister Frank-Walter Steinmeier and his Iranian counterpart Manouchehr Mottaki met Monday in Berlin for more than an hour, with Steinmeier also urging Tehran to respond constructively to the international community's demands or run the risk of further Security Council action.
Steinmeier expressed disappointment over Iran's lack of cooperation and called for Tehran to provide the Vienna-based watchdog immediately with the information it needs, said an official with the German delegation, who demanded anonymity for discussing the private meeting.
But Ali-Ashgar Soltanieh, Iran's chief delegate to the IAEA, asserted there was nothing for the agency to investigate as far as weapons programs were concerned.
"The Americans did a lousy job with the CIA and associated terrorist groups that work with them," he told the AP, alluding to Iranian claims that the American intelligence pointing to past Iranian weapons programs was forged.
Iran's refusal to end enrichment has been the main trigger for sanctions and continues to be the overriding concern for the United States and others who suspect the program is aimed at making weapons.
If Iran continues to block investigators, the IAEA "will not be able to provide credible assurance about the absence of undeclared nuclear material and activities in Iran," said the report.
Intelligence received by the IAEA in its investigations, as well as from the U.S. and other agency board member nations, suggest Iran experimented with an undeclared uranium enrichment program that was linked to a missile project and drew up blueprints on refitting missiles to allow them to carry nuclear warheads.
The intelligence also suggested Iran was researching construction of an underground site that apparently could be used to test fire nuclear bombs and ordered "dual use" equipment from abroad that could be part of an atomic weapons program.
Additionally, Iran possesses diagrams showing how to mold uranium metal into the shape of warheads.
U.S. intelligence estimates that Iran conducted such experiments until 2003. Iran rejects such allegations and says documents backing them up are fabricated.
In Tehran, the official news agency reported Iranian warplanes and air defense units are taking part in ongoing war games. The war games follow Israel's major aerial exercise over th
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