Kourosh ZiabariAsia Times: An attack on Iran’s Natanz uranium enrichment facility on April 11 has been blamed on Israel by Iranian officials, an accusation that threatens to hamper efforts now underway to revive the Joint Comprehensive Plan of Action (JCPOA) nuclear pact.

The apparent cyber-attack, which caused a power blackout at the plant situated eight meters underground, reportedly inflicted substantial damage to a number of centrifuges operating at the installation.

Although Iranian officials have ruled out casualties or leakage of hazardous material, anonymous American and Israeli officials quoted in media reports have conjectured that the attack may have set back Iran’s nuclear program by at least nine months.

Ali Akbar Salehi, the head of Iran’s Atomic Energy Organization, has termed the attack an act of “nuclear terrorism” and called on the international community to side with Iran in condemning the action, of which the US has denied any involvement.

The attack could not have come at a worse diplomatic time for the JCPOA. German Foreign Minister Heiko Maas has intimated that the attack has the potential to derail the diplomatic maneuvering now underway to bring Iran and the US back into the pact.

Iran’s immediate response to the attack has been to announce the imminent start of uranium enrichment to 60% purity, critically close to the 90% required for manufacturing nuclear weapons, analysts say.

Iran’s new gambit to hike up its uranium enrichment to its highest level ever is a drastic departure from the terms of the nuclear deal signed in July 2015, which mandated Tehran to keep its enrichment within the bounds of 3.67%.

The Israeli daily Jerusalem Post has claimed that Mossad, the Jewish state’s national intelligence agency, was behind the attack that knocked out several centrifuges at Iran’s main enrichment facility. Asia Times could not independently confirm the report.

The Israeli government has so far clung to its traditional “deliberate ambiguity” policy and refused to confirm or deny any role in the attack. It was not the first time, though, the Natanz complex was targeted presumably by Israel.

In 2010, a sophisticated computer worm known as “Stuxnet,” reported to have been jointly developed by the US and Israel, infiltrated Natanz facility computers and took control of the machine running the centrifuges, desynchronized the velocity at which the devices spun and ruined nearly a thousand of them by prompting them to crash or self-destruct.