The attack on Iran's key Natanz nuclear site Sunday was caused by an explosive device that was smuggled into the plant and detonated remotely, the New York Times reported Tuesday.
Citing an unnamed intelligence official, the report said that the explosion, which has been attributed by foreign media to Israel, damaged Natanz's primary and backup electrical systems. Behrouz Kamalvandi, a spokesperson for Iran's Atomic Energy Organization, said that the attack blew a hole so big that he managed to fall into it, and suffered injuries.
It also quotes Fereydoun Abbasi, the head of the Iranian Parliament's energy committee, who told state television Monday that "The enemy's plot was very beautiful" from a scientific standpoint. "They thought about this and used their experts and planned the explosion so both the central power and the emergency power cable would be damaged."
Also on Tuesday, former Prime Minister Ehud Olmert told the Ynet news website that "what happened two days ago in Natanz wasn't caused by someone who broke in there in the middle of the night. The explosives were planted there in advance, maybe 10 or 15 years ago."
He added, "I can think of operations that were carried out in the past to plant devices."
Later that day, Iran's Iranian Foreign Minister Mohammad Javad Zarif said that the attack on Natanz which Iran blames on Israel was a "very bad gamble" that would strengthen Tehran's hand in talks to revive the 2015 nuclear deal with major powers.
"Israel played a very bad gamble if it thought that the attack will weaken Iran's hand in the nuclear talks," Iranian Foreign Minister Mohammad Javad Zarif told a joint news conference with his Russian counterpart in Tehran.
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"On the contrary, it will strengthen our position."
Electricity was restored at the plant and uranium enrichment has not ceased, Ali Akbar Salehi, who leads the Atomic Energy Organization said. "A large portion of the enemy's sabotage can be restored, and this train cannot be stopped," he said to Iranian media Monday. But the plant is still not running close to full capacity.
The Natanz facility, which is located in the desert in the central province of Isfahan, is the centerpiece of Iran's uranium enrichment program and monitored by inspectors of the International Atomic Energy Agency, the UN nuclear watchdog. The attack, which Kamalvandi said had no casualties, was reported a day after Tehran launched new, advanced uranium enrichment centrifuges there.
The United States said Monday that it was not involved in the attack, which Iran blamed on Israel. "The U.S. was not involved in any manner," White House press secretary Jen Psaki said at a briefing. "We have nothing to add on speculations about the causes or impact."
Some U.S. officials did express concern that the Natanz explosion will cause the Iranians to increase their clandestine nuclear activities.
Israel and Iran have been engaged in a long-running covert war. Tehran vowed revenge for what it described as an act of "nuclear terrorism" that caused an electricity outage in one of the production halls at the uranium enrichment plant.
In a letter to the United Nations Secretary-General Antonio Guterres, Iran's Foreign Minister Javad Zarif argued: "Deliberate targeting of a safeguarded nuclear facility – with high risk of indiscriminate release of radioactive material – is nuclear terrorism and a war crime."
Israel fiercely opposes Tehran's 2015 nuclear deal with major powers, an accord that Iran and the new administration of President Joe Biden are engaged in trying to revive after then-U.S. President Donald Trump abandoned it three years ago.
Israel, whose existence Iran does not recognize, has not formally commented on the incident.
Iran and the global powers described as "constructive" talks last week in Vienna to salvage the nuclear deal, which has unraveled as Iran has breached its limits on sensitive uranium enrichment since Trump reimposed harsh sanctions on Tehran.
A U.S. official told the Times that Washington has no reason to believe that Iran will change its approach to the Vienna talks, due, to resume Wednesday, because of the Natanz explosion, but that it is too soon to tell.
Reuters contributed to this report.