So it is unclear when Israel concluded that the facility was linked to the nuclear program, or why it did not raise the public alarm earlier, before it was dismantled.

While some information was given by Israel to inspectors at the International Atomic Energy Agency, it is not clear that Abadeh was included. Nor is it clear why Mr. Netanyahu did not reveal the facility’s existence as soon as the satellite imagery he cited had detected the Iranians dismantling it earlier this summer.

There was no immediate comment from the energy agency, the Vienna-based nuclear monitor of the United Nations, which polices Iran’s compliance with the Nonproliferation Treaty and the 2015 nuclear agreement that Mr. Trump has abandoned.

But hours before Mr. Netanyahu spoke, the agency’s acting director general, Cornel Feruta, said that in a just-completed visit to Iran, he had “stressed the need for Iran to respond promptly to agency questions related to the completeness of Iran’s safeguards declarations.”

Mr. Feruta declined to specify what the agency’s inspectors wanted to know from the Iranians.

The agency has said for years that Iran halted organized efforts at exploring possible nuclear weapons in 2003. American intelligence officials have made the same conclusion.

The Israelis have accused the agency inspectors of inadequate supervision of Iran. According to Yossi Cohen, the chief of the Mossad, Israel’s spy agency, a major purpose of stealing the nuclear archive was to give the agency information on where to look in Iran.

“Make no mistakes: The target of the operation in Tehran was not only to obtain intelligence, or to make an impression on the world’s consciousness,” he said in speech last June.