Iran’s Natanz nuclear facility south of Tehran, suffered a problem Sunday involving its electrical distribution grid. The incident happened just hours after the facility’s new advanced centrifuges, which can more quickly enrich uranium, came online. At first, Iranian state TV reported the incident as an accident but later changed the narrative and called it a sabotage.

Power was cut to the above-ground workshops and underground enrichment halls, civilian nuclear program spokesman Behrouz Kamalvandi told Iranian state television.

Ali Akbar Salehi, one of Iran’s top nuclear officials, did not say who was to blame for the “terrorist act”, which caused the power failure.

Yet, many news media sites are saying that it was the work of the Israeli Mossad spy agency. 

Salehi urged the International Atomic Energy Agency to deal with, what he called, nuclear terrorism.

This is the latest incident impacting one of Tehran’s most secure sites; it comes amid negotiations over the renewal of the Joint Comprehensive Plan of Action (JCPOA).

Despite the renewed negotiations between Iran and the other JCPOA signatories in Vienna, the Iranians not only conducted another breach of the nuclear agreement on Saturday but advertised it on state-run television: Under the JCPOA, Iran is allowed to produce and store limited qualities of enriched uranium, which is to be used for the production of fuel for commercial power plants. However, the Iranians have been enriching uranium one step below weapons-grade.

Iran’s President Hassan Rouhani was filmed live over the weekend as he inaugurated new centrifuges at the Natanz site in a ceremony. The story carried the news that the new improved centrifuges were enriching uranium.