The Iranian foreign minister has said his country will "take revenge" for an attack on an underground nuclear site, for which it has blamed Israel.
Iranian officials said the Natanz uranium enrichment plant was the target of "nuclear terrorism" on Sunday, after initially reporting a power failure.
New advanced centrifuges to enrich uranium had just been activated there.
Israel has not commented, but public radio cited intelligence sources as saying it was a Mossad cyber operation.
They said it had caused more extensive damage than Iran had reported.
Iran's Nour News agency, which is affiliated to the Supreme National Security Council, meanwhile cited a source at the intelligence ministry as saying the "main perpetrator" behind the disruption to the electricity system had been identified and that "necessary measures are being taken to arrest this person".
Israel has recently stepped up its warnings about its arch-foe's nuclear programme amid efforts to revive a 2015 nuclear deal that was abandoned by former US President Donald Trump.
His successor, Joe Biden, has said he wants to return to the landmark accord. But Iran and the five other world powers still party to it - China, France, Germany, Russia and the UK - need to find a way for him to lift US sanctions and for Iran to return to the agreed limits on its nuclear programme.
US and Iranian officials are holding indirect talks in the Austrian capital, Vienna, to try to break the impasse, with European officials acting as intermediaries.
The European Union said it still needed to clarify the facts about the Natanz incident, but that it rejected "any attempts to undermine or weaken diplomatic efforts on the nuclear agreement".
"The Zionists want to take revenge because of our progress in the way to lift sanctions," Iranian Foreign Minister Mohammad Javad Zarif was quoted by state media as saying on Monday.
"They have publicly said that they will not allow this. But we will take our revenge from the Zionists."
Iran does not recognise Israel's right to exist and often refers to it as the "Zionist state".
Foreign ministry spokesman Saeed Khatibzadeh later told a news conference in the capital, Tehran, that Israel was "of course" behind the attack on Natanz.
"This incident, fortunately, did not cause any damage to human lives or the environment. However, it could have been a catastrophe. This is a crime against humanity and carrying out such actions is in line with the essence of the Zionist regime," he said.
Mr Khatibzadeh said only the least efficient "IR-1" centrifuges were damaged in the incident, and that they would be replaced with advanced ones.
Israeli Prime Minister Benjamin Netanyahu did not mention the incident at a ceremony on Sunday with military and intelligence chiefs. But he said: "The battle against Iran and its proxies and its nuclearisation is a massive task."
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