Inspectors from the UN’s nuclear agency have found traces of radioactive material at a building in Tehran that Prime Minister Benjamin Netanyahu identified last year as a “secret atomic warehouse,” an Israeli television report said on Thursday.

Inspectors from the International Atomic Energy Agency visited the site several times after Netanyahu identified it in an address to the UN General Assembly last September, took soil samples, and have now definitively concluded that there were “traces of radioactive material” there, Channel 13 news reported.

It quoted what it said were four senior Israeli officials involved in the matter, and said the UN agency’s findings had become known to these officials recently.

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Iran has denied that the site was a nuclear facility or served any secretive purpose. In an initial response to Netanyahu’s UN speech, Iranian state media claimed the warehouse was actually a recycling facility for scrap metal.

But the IAEA inspectors, who last visited the site in March, have reached a “definitive conclusion” that “there were traces of radioactive material” there, Channel 13 said, and are currently preparing a report on the matter.

The TV report noted that “the storing of radioactive material in a secret facility without informing the IAEA is a breach of the Treaty on the Non-Proliferation of Nuclear Weapons [NPT], to which Iran is a signatory.”

Indicating that Washington is also aware of the IAEA inspectors’ findings, the TV report said that Israel and the US expect the agency to issue a public report on the matter shortly.

Coincidentally or otherwise, Netanyahu spoke on Wednesday by phone with US President Donald Trump about Iran. “The two leaders discussed cooperation between the United States and Israel in advancing shared national security interests, including efforts to prevent Iran’s malign actions in the region,” the White House said.

Speaking at the United Nations last September, Netanyahu called on the IAEA to inspect what he said was the “secret atomic warehouse” in the Iranian capital.

He claimed some 15 kilograms (33 pounds) of radioactive material had been recently removed from the atomic warehouse and squirreled away around Tehran, endangering the capital’s residents. The site may have contained as much as 300 tons of nuclear-related equipment and material in 15 shipping containers, Netanyahu added. He did not specify what nuclear material was contained at the site.

Netanyahu specified that there was a rug-cleaning business nearby: “Like the atomic archive [revealed by the prime minister in April], it’s another innocent-looking compound. Now, for those of you at home using Google Earth, this no-longer-secret atomic warehouse is on Maher Alley, Maher Street. You have the coordinates, you can try to get there. And for those of you who try to get there, it’s 100 meters from the Kalishoi, the rug cleaning operation. By the way, I hear they do a fantastic job cleaning rugs there. But by now they may be radioactive rugs.”

He added: “Now, countries with satellite capabilities may notice some increased activity on Maher Alley in the days and weeks ahead. The people they’ll see scurrying back and forth are Iranian officials desperately trying to finish the job of cleaning up that site. Because, you see, since we raided the atomic archive, they’ve been busy cleaning out the atomic warehouse.

“Just last month, they removed 15 kilograms of radioactive material,” he went on. “You know what they did with it? They had 15 kilograms of radioactive material, they had to get it out of the site, so they took it out and they spread it around Tehran in an effort to hide the evidence. The endangered residents of Tehran may want to know that they can get a Geiger counter on Amazon for only $29.99… They took this radioactive material and spread it around Tehran.

“Now, the Iranian officials cleaning out that site still have a lot of work to do because they’ve had at least, at least 15 ship containers, they’re gigantic, 15 ship containers full of nuclear related equipment and material stored there. Now, since each of those containers can hold 20 tons of material, this means that this site contains as much as 300 tons, 300 tons of nuclear related equipment and material.”

That speech came months after Israel’s disclosure that it had spirited away what it said was a “half-ton” of Iranian nuclear documents from Tehran, with Netanyahu saying both the archive and the warehouse were proof that Iran continues to seek atomic weapons despite the 2015 international agreement to limit its nuclear program. “Iran has not abandoned its goal to develop nuclear weapons…. Rest assured that will not happen. What Iran hides, Israel will find,” Netanyahu told the UN.

Following Netanyahu’s UN appearance, IAEA head Yukiya Amano said nuclear inspectors had visited “all the sites and locations in Iran which it needed to visit,” while pushing back against the prime minister’s assertion that the organization had failed to act on intelligence provided by Israel on the warehouse.

Diplomats quoted in April, however, said the IAEA visited the site in Tehran’s Turquzabad district multiple times the previous month. They said tests were underway on environmental samples taken from the facility in order to determine if nuclear materials were present there. It was said then that results could be ready by June.

“We have nothing to hide and any access given to the IAEA so far has been in the framework of laws and regulations and nothing beyond that,” an Iranian official said at the time.

Referring to Netanyahu’s statements as “ridiculous,” an Iranian state TV report said the country was committed to nonproliferation and noted Iran’s nuclear program was under surveillance of the IAEA. A state TV website briefly reported the Netanyahu accusation and called it an “illusion.”

A Tasnim News reporter who visited the warehouse last October was told by a worker from inside the facility that it was not a military site, and that the Israeli leader was “a stupid person” for believing it was a nuclear warehouse. The reporter did not enter the facility, only speaking to the worker via intercom from outside the locked gate.

The owner of the nearby carpet cleaning business told Tasnim “there was nothing out of the ordinary” about the warehouse, and asserted that Netanyahu was fed disinformation to “make him a fool.”

Netanyahu was a vocal opponent of the 2015 nuclear deal with Iran when it was signed under Trump’s predecessor Barack Obama, arguing that it would not stop but only delay Iran’s nuclear weapon program, while removing sanctions critical to curbing Tehran. He praised Trump for withdrawing from the accord in May.

Iran has denied it is seeking atomic weapons, while warning it would walk back its commitment to the nuclear accord if it does not receive economic inducements from its remaining signatories — Britain, France, Germany, Russia and China. In recent days, it has breached the accord’s cap on uranium enrichment levels.

Agencies contributed to this report.