Explosion at Iran nuclear site hit new centrifuge plant: US-based analysts

Explosion at Iran nuclear site hit new centrifuge plant: US-based analysts

A fire and an explosion struck a building above Iran’s underground Natanz nuclear enrichment facility early on Thursday, a site that US-based analysts identified as a new centrifuge production plant.

The Atomic Energy Organization of Iran sought to downplay the fire, calling it an “incident” that only affected an under-construction “industrial shed,” spokesman Behrouz Kamalvandi said. However, both Kamalvandi and Iranian nuclear chief Ali Akbar Salehi rushed after the fire to Natanz, which has been targeted in sabotage campaigns in the past.

Kamalvandi did not identify what damaged the building, though Natanz governor Ramazanali Ferdowsi said a “fire” had struck the site, according to a report by the semiofficial Tasnim news agency. Authorities offered no cause for the blaze, though Iran’s state-run IRNA news agency published a commentary addressing the possibility of sabotage by enemy nations such as Israel and the US following other recent explosions in the country.

“The Islamic Republic of Iran has so far has tried to prevent intensifying crises and the formation of unpredictable conditions and situations,” the commentary said. But “the crossing of red lines of the Islamic Republic of Iran by hostile countries, especially the Zionist regime and the US, means that strategy … should be revised.”

A photograph later released by the atomic energy agency and state TV video showed a brick building with scorch marks and its roof apparently destroyed. Debris on the ground and a door that looked blown off its hinges suggested an explosion accompanied the blaze.

Data collected by a US National Oceanic and Atmospheric Administration satellite suggested the fire broke out around 2 AM local time in the northwest corner of the Natanz compound. Flames from the blaze were bright enough to be detected by the satellite from space.

“There are physical and financial damages and we are investigating to assess,” Kamalvandi told Iranian state television.

“Furthermore, there has been no interruption in the work of the enrichment site. Thank God, the site is continuing its work as before.”

The site of the fire corresponds to a newly opened centrifuge production facility, said Fabian Hinz, a researcher at the James Martin Center for Nonproliferation Studies at the Middlebury Institute of International Studies in Monterey, California. He said he relied on satellite images and a state TV program on the facility to locate the building, which sits in Natanz’s northwest corner.

David Albright of the Institute for Science and International Security similarly said the fire struck the production facility. His institute previously wrote a report on the new plant, identifying it from satellite pictures while it was under construction and later built.

Iranian nuclear officials did not respond to a request for comment about the analysts’ comments. However, any damage to the facility would be a major setback, said Hinz, who called the fire “very, very suspicious.”

“It would delay the advancement of the centrifuge technology quite a bit at Natanz,” Hinz said. “Once you have done your research and development, you can’t undo that research and development. Targeting them would be very useful” for Iran’s adversaries.

There was no previously announced construction work at Natanz, a uranium enrichment center some 250 kilometers (155 miles) south of Tehran. Natanz includes underground facilities buried under some 7.6 meters (25 feet) of concrete, offering protection from airstrikes.

Natanz, also known as the Pilot Fuel Enrichment Plant, is among the sites now monitored by the International Atomic Energy Agency after Iran’s 2015 nuclear deal with world powers.

The IAEA said in a statement it was aware of reports of the fire. “We currently anticipate no impact on the IAEA’s safeguards verification activities,” the Vienna-based agency said.

Located in Iran’s central Isfahan province, Natanz hosts the country’s main uranium enrichment facility. There, centrifuges rapidly spin uranium hexafluoride gas to enrich uranium. Currently, the IAEA says Iran enriches uranium to about 4.5 percent purity, above the terms of the nuclear deal, but far below weapons-grade levels of 90 percent. It also has conducted tests on advanced centrifuges, according to the IAEA.

Natanz also remains of particular concern to Tehran as it has been targeted for sabotage before. The Stuxnet computer virus, widely believed to be an American and Israeli creation, disrupted and destroyed centrifuges at Natanz amid the height of Western concerns over Iran’s nuclear program.

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