Israel’s Mossad security service was behind a major power cut that halted uranium enrichment at Iran’s Natanz nuclear facility on Sunday, unidentified intelligence sources told Hebrew media outlets, in what Iran described as an act of “nuclear terrorism.”
In the early hours of Sunday morning, the underground Natanz facility suffered an electrical disruption in what was widely speculated to be an Israeli cyberattack. Iran said the attack did not cause any casualties and did not cause radioactive pollution. Israel has officially refrained from commenting on the matter, and Iran has not specifically accused the Jewish state of being responsible for the incident.
On Sunday evening, unnamed intelligence sources were cited by a number of Hebrew news outlets as saying that the Mossad was involved in the attack, which was reportedly more severe than Iran had indicated.
According to Channel 13 news, the cyberattack caused “severe damage at the heart of Iran’s enrichment program.”
The timing of the attack was also said to not be incidental, coming the day after Iran celebrated its National Nuclear Technology Day; the day after Iranian scientists began operating more powerful centrifuges; and amid ongoing talks in Vienna aimed at revitalizing the flagging 2015 nuclear accord between Iran and world powers, which Israel fiercely opposes.
The disruption at Natanz appears to have been designed to counter Iran’s efforts to raise pressure on the United States by amassing greater quantities of uranium and enriching it to higher levels as the two sides negotiate a return to the 2015 nuclear deal.
The spokesman for Iran’s atomic program, Ali Akbar Salehi, confirmed that the electrical disruption at Natanz was a deliberate act of sabotage, calling it “nuclear terrorism.”
In comments carried by Iranian state news, Salehi refrained from identifying a perpetrator, but said the attack was carried out by those who oppose Iran’s ongoing negotiations with the West to remove the sanctions against Tehran through the nuclear deal.
“To thwart the goals of this terrorist movement, the Islamic Republic of Iran will continue to seriously improve nuclear technology on the one hand and to lift oppressive sanctions on the other hand,” Salehi said, according to state TV.
He added: “While condemning this desperate move, the Islamic Republic of Iran emphasizes the need for a confrontation by the international bodies and the (International Atomic Energy Agency) against this nuclear terrorism.”
On Sunday, Israel’s government announced that the high-level security cabinet is scheduled to meet next week for the first time since early February, reportedly to discuss the Iran issue. The meeting was reportedly called at the request of Defense Minister Benny Gantz and Attorney General Avichai Mandelblit, in light of the recent exchanges between Israel and Iran.
Prime Minister Benjamin Netanyahu appeared to refer to the recent events in Iran at a ceremony honoring the country’s security forces on Sunday night, saying the fight against the Islamic Republic was a massive undertaking.
“The fight against Iran and its proxies and the Iranian armament is a giant mission. The situation that exists today doesn’t say anything about the situation that will exist tomorrow,” Netanyahu said.
Last Tuesday, an Iranian cargo ship said to serve as a floating base for Iran’s paramilitary Revolutionary Guard forces off the coast of Yemen was struck by an explosion, likely from a limpet mine. Iran has blamed Israel for the blast. An American official told the New York times that Israel was behind the attack.
A private Israeli intelligence firm released a satellite photograph of the ship from Sunday, showing that the vessel has not moved since last week’s attack and remained anchored in the Red Sea, directly between Yemen and Eritrea.
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The Natanz nuclear facility, which maintains aboveground workshops and subterranean uranium enrichment halls, is considered a major facet of Iran’s atomic program. The alleged Israeli attack against it came hours after scientists at the site turned on a chain of 164 advanced IR-6 centrifuges that threatened to shorten the amount of time it would take for Iran to amass the highly enriched uranium needed for a nuclear bomb.
On Saturday, officials also began testing the IR-9 centrifuge, which they say will enrich uranium 50 times faster than Iran’s first-generation centrifuges, the IR-1. The nuclear deal limited Iran to using only IR-1s for enrichment.
Natanz was largely built underground to withstand enemy airstrikes. It became a flashpoint for Western fears about Iran’s nuclear program in 2002, when satellite photos showed Iran building its underground centrifuges facility at the site, some 200 kilometers (125 miles) south of the capital, Tehran.
Last summer, an explosion rocked the Natanz facility, in what was also said to have been an Israeli attack aimed at disrupting uranium enrichment and research at the site.
In 2010, the United States and Israel allegedly halted Iran’s nuclear program with the Stuxnet virus, which caused Iranian centrifuges to tear themselves apart, reportedly destroying a fifth of the country’s machines.
Iran has also blamed Israel for the killing last year of scientist Mohsen Fakhrizadeh, who began the country’s military nuclear program decades earlier.
Sunday’s incident came as US Defense Secretary Lloyd Austin landed in Israel for talks with Netanyahu and Gantz. The US, Israel’s main security partner, is seeking to reenter the 2015 atomic accord aimed at limiting Tehran’s program so that it cannot pursue a nuclear weapon — a move staunchly opposed by Israel, particularly Netanyahu.
Meeting with Austin on Sunday, Gantz said Israel viewed America as an ally against all threats, including Iran.
“The Tehran of today poses a strategic threat to international security, to the entire Middle East and to the State of Israel,” Gantz said. “And we will work closely with our American allies to ensure that any new agreement with Iran will secure the vital interests of the world, of the United States, prevent a dangerous arms race in our region, and protect the State of Israel.”
In addition to an ongoing, largely covert fight on the nuclear front, Tehran and Jerusalem are engaged in a maritime shadow war, with both sides blaming the other for explosions on vessels.
In recent months, at least two Israeli-owned cargo ships have been damaged in alleged Iranian attacks, one in the Gulf of Oman and the other as it was sailing to India.
IDF Chief of Staff Aviv Kohavi appeared to reference the recent tensions between Israel and Iran in a speech on Sunday.
The Israeli military’s “operations in the Middle East are not hidden from the eyes of the enemy,” Kohavi said. “They are watching us, seeing [our] abilities and weighing their steps with caution.”
Since then-US president Donald Trump’s withdrawal from the Iran nuclear deal in 2018, Tehran has abandoned all the limits of its uranium stockpile. It now enriches up to 20 percent purity, a technical step away from weapons-grade levels of 90%. Iran maintains that its atomic program is for peaceful purposes — despite its leaders regularly threatening to destroy Israel and the Mossad stealing and publicizing Iranian documents showing plans to affix a nuclear device onto a missile — but fears about Tehran having the ability to make a bomb saw world powers reach the deal with the Islamic Republic in 2015.
The deal lifted economic sanctions on Iran in exchange for it limiting its program and allowing IAEA inspectors to keep a close watch on its work, though not at military sites and some other locations — a key sticking point for critics of the deal.
US President Joe Biden hopes to return to the 2015 agreement, which his predecessor Trump abandoned in favor of a “maximum pressure” campaign in hopes of bringing Tehran to its knees. However, Biden has maintained that he will remove sanctions on Iran only after it returns to compliance with the nuclear deal. Iran, meanwhile, is demanding full sanctions relief before it returns to the negotiating table.
Times of Israel staff and Agencies contributed to this report.