Iran’s underground Natanz nuclear facility lost power Sunday just hours after starting up new advanced centrifuges capable of enriching uranium faster, the latest incident to strike the site amid negotiations over the tattered atomic accord with world powers.
As Iranian officials investigated the outage, many Israeli media outlets offered the similar assessment that a cyberattack darkened Natanz and damaged a facility that is home to sensitive centrifuges. While the reports offered no sourcing for the evaluation, Israeli media maintains a close relationship with the country’s military and intelligence agencies.
If Israel caused the blackout, it further heightens the tensions between the two nations already engaged in a shadow conflict across the wider Middle East.
It also complicates efforts by the U.S., Israel’s main security partner, to re-enter the atomic accord aimed at limiting Tehran’s program so it couldn’t pursue a nuclear weapon if it chose. As news of the blackout emerged, U.S. Defense Secretary Lloyd Austin landed in Israel on Sunday for talks with Netanyahu and Israeli Defense Minister Benny Gantz.
Power at Natanz had been cut across the facility comprised of above-ground workshops and underground enrichment halls, civilian nuclear program spokesman Behrouz Kamalvandi told Iranian state television.
“We still do not know the reason for this electricity outage and have to look into it further,” Kamalvandi said. “Fortunately, there was no casualty or damage and there is no particular contamination or problem.”
Asked by the state TV correspondent if it was a “technical defect or sabotage,” Kamalvandi declined to comment.
Malek Shariati Niasar, a Tehran-based lawmaker who serves as spokesman for the Iranian parliament’s energy committee, wrote on Twitter that the incident was “very suspicious,” raising concerns about possible “sabotage and infiltration.” He said lawmakers were pursuing details of the incident as well.
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The Vienna-based International Atomic Energy Agency, which monitors Iran’s program, said it was “aware of the media reports,” but declined to comment.
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.
Natanz suffered a mysterious explosion at its advanced centrifuge assembly plant in July that authorities later described as sabotage. Iran now is rebuilding that facility deep inside a nearby mountain.
Israel, Iran’s regional archenemy, has been suspected of carrying out that attack as well as launching other assaults, as world powers now negotiate with Tehran in Vienna over its nuclear deal.
Iran also blamed Israel for the killing of a scientist who began the country’s military nuclear program decades earlier. The Stuxnet computer virus, discovered in 2010 and widely believed to be a joint U.S.-Israeli creation, once disrupted and destroyed Iranian centrifuges at Natanz.
Israel has not claimed any of the attacks, though Prime Minister Benjamin Netanyahu repeatedly has described Iran as the major threat faced by his country in recent weeks.
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.”
The Israeli army’s chief of staff, Lt. Gen. Aviv Kochavi, also appeared to reference Iran.
The Israeli military’s “operations in the Middle East are not hidden from the eyes of the enemy,” Kochavi said. “They are watching us, seeing (our) abilities and weighing their steps with caution.”
Multiple Israeli media outlets reported Sunday that a cyberattack caused the blackout in Natanz. Public broadcaster Kan said Israel was likely behind the attack, citing Israel’s alleged responsibility for the Stuxnet attacks a decade ago. Channel 12 TV cited “experts” as estimating the attack shut down entire sections of the facility. None of the reports included sources or explanations on how the outlets came to that assessment.
In Tehran, Iranian officials meanwhile awaited the arrival of South Korean Prime Minister Chung Sye-kyun, the first visit by a premier from Seoul since before the 1979 Islamic Revolution. Iran on Friday released a South Korean oil tanker held since January amid a dispute with Seoul over billions of dollars of its assets frozen there.
On Saturday, Iran announced it had launched a chain of 164 IR-6 centrifuges at the plant. 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.
Since then-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% purity, a technical step away from weapons-grade levels of 90%. Iran maintains its atomic program is for peaceful purposes, 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.
On 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. That attack escalated a long-running shadow war in Mideast waterways targeting shipping in the region.
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Ben Zion reported from Jerusalem. Associated Press writer Nasser Karimi in Tehran, Iran, contributed to this report.
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