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VIENNA 鈥 Iran carried out secret nuclear activities with material not declared to the United Nations (UN) nuclear watchdog at three locations that have long been under investigation, the watchdog said in a wide-ranging, confidential report to member states seen by Reuters.

The findings in the 鈥渃omprehensive鈥 International Atomic Energy Agency (IAEA) report requested by the agency鈥檚 35-nation Board of Governors in November pave the way for a push by the United States, Britain, France and Germany for the board to declare Iran in violation of its non-proliferation obligations.

A resolution would infuriate Iran and could further complicate nuclear talks between Tehran and Washington.

Using the IAEA report鈥檚 findings, the four Western powers plan to submit a draft resolution for the board to adopt at its next meeting the week of June 9, diplomats say. It would be the first time in almost 20 years Iran has formally been found in non-compliance.

Iran鈥檚 foreign ministry and the Iranian nuclear agency rejected the report, calling it 鈥減olitically motivated鈥 in a joint statement. They said Tehran will take 鈥渁ppropriate measures鈥 in response to any effort to take action against the country at the Board of Governors meeting, state media reported, without elaborating.

Tehran says it wants to master nuclear technology for peaceful purposes and has long denied accusations by Western powers that it is seeking to develop nuclear weapons.

While many of the findings relate to activities dating back decades and have been made before, the IAEA report鈥檚 conclusions were more definitive. It summarized developments in recent years and pointed more clearly towards coordinated, secret activities, some of which were relevant to producing nuclear weapons.

It also spelled out that Iran鈥檚 cooperation with IAEA continues to be 鈥渓ess than satisfactory鈥 in 鈥渁 number of respects.鈥 The IAEA is still seeking explanations for uranium traces found years ago at two of four sites it has been investigating. Three hosted secret experiments, it found.

The IAEA has concluded that 鈥渢hese three locations, and other possible related locations, were part of an undeclared structured nuclear program carried out by Iran until the early 2000s and that some activities used undeclared nuclear material,鈥 the report said.

Nuclear material and/or heavily contaminated equipment from that program was stored at the fourth site, Turquzabad, between 2009 and 2018, it said.

鈥淭he Agency concludes that Iran did not declare nuclear material and nuclear-related activities at three undeclared locations in Iran, specifically, Lavisan-Shian, Varamin, and Turquzabad,鈥 the report said.

At Lavisan-Shian in Tehran, a disc made of uranium metal was 鈥渦sed in the production of explosively driven neutron sources鈥 at least twice in 2003, a process designed to initiate the explosion in a nuclear weapon, the report said, adding that it was part of 鈥渟mall-scale鈥 tests.

The report is likely to lead to Iran being referred to the UN Security Council, though that would probably happen at a later IAEA board meeting, diplomats said.

More immediately, it is likely to lead to Iran again accelerating or expanding its rapidly advancing nuclear program, as it has done after previous rebukes at the board. It could also further complicate talks with the United States aimed at reining in that program.

URANIUM ENRICHMENT
A separate IAEA report sent to member states on Saturday said Iran鈥檚 stock of uranium enriched to up to 60% purity, close to the roughly 90% of weapons grade, had grown by roughly half to 408.6 kilograms. That is enough, if enriched further, for nine nuclear weapons, according to an IAEA yardstick.

Both IAEA reports said enrichment to such a high level was 鈥渙f serious concern鈥 since it is the only country to do so without producing nuclear weapons.

Israel, which has long urged strong action against Iran鈥檚 nuclear program, said the IAEA report showed Tehran was determined to complete its nuclear weapons program. Prime Minister Benjamin Netanyahu鈥檚 office said the world should act now to stop Iran from doing this.

US intelligence agencies and the IAEA have long believed Iran had a secret, coordinated nuclear weapons program that it halted in 2003. Iran denies ever having had one.

Separately on Saturday, Foreign Minister Abbas Araghchi said his Omani counterpart presented elements of a US proposal for a nuclear deal between Tehran and Washington during a short visit to Tehran.

In Washington, White House Press Secretary Karoline Leavitt said later on Saturday that President Donald J. Trump鈥檚 special envoy Steve Witkoff 鈥渉as sent a detailed and acceptable proposal to the Iranian regime, and it鈥檚 in their best interest to accept it.鈥漇he declined to provide further details.

Mr. Araghchi said in a post on X that Iran 鈥渨ill respond to the US proposal in line with the principles, national interests and rights of people of Iran.鈥

His statement came ahead of an anticipated sixth round of talks between Washington and Tehran. The date and venue of talks have not yet been announced. Reuters