apparent mine attack by Israel on an Iranian military vessel in the Red Sea, the American official said.

A cargo ship owned by the same company, the Helios Ray, was attacked by Iran earlier this year.

Iranian officials also revealed more details about the Natanz attack on Tuesday, suggesting that the damage was greater than Iran previously reported.

Alireza Zakani, a member of Parliament and head of its research center, said on state television that “several thousand of our centrifuges have been completely destroyed,” representing a large portion of the country’s ability to enrich uranium.

He described official statements on Monday that the facility would be quickly repaired as false promises.

Foreign intelligence officials have said it could take many months for Iran to undo the damage.

Iranian officials have been livid about the security lapses that have allowed a series of attacks on Iran’s nuclear program over the past year, ranging from sabotage of nuclear facilities to the theft of classified documents to the assassination of Iran’s chief nuclear scientist. Most of these attacks were presumed to have been carried out by Israel.

Mr. Zakani criticized Iran’s security apparatus as lax, saying it had allowed spies to “roam free,” turning Iran into “a haven for spies.”

He said that in one incident, some nuclear equipment belonging to a major facility was sent abroad for repair and that when it returned the equipment was packed with 300 pounds of explosives. In another incident, he said, explosives were placed in a desk and smuggled inside the nuclear facility.

Iran has long maintained that its nuclear program is peaceful and aimed at energy development. Israel claims that Iran had and may still have an active nuclear weapons program and considers the possibility of a nuclear-armed Iran an existential threat.

The nuclear talks that began in Vienna last week have been delayed because a member of the European Union delegation tested positive for the coronavirus. The talks could resume as early as Thursday if the member tests negative.

Patrick Kingsley, Ronen Bergman and Steven Erlanger contributed reporting.

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