cascades, or clusters, of different advanced models of centrifuge to its below-ground Fuel Enrichment Plant (FEP). In September 2020, the IAEA reported that Iran had accumulated ten times as much enriched uranium as permitted by the JCPOA. In November 2020, the IAEA reported that Iran had started feeding uranium hexafluoride (UF6) into a newly installed underground cascade of 174 advanced IR-2m centrifuges at Natanz, which the JCPOA did not permit. Iran's top nuclear scientist, Mohsen Fakhrizadeh, was assassinated in Tehran, Iran on 27 November 2020. Fakhrizadeh was believed to be the primary force behind Iran's covert nuclear program for many decades. The New York Times reported that Israel's Mossad was behind the attack and that Mick Mulroy, the former Deputy Defense Secretary for the Middle East said the death of Fakhirizadeh was "a setback to Iran’s nuclear program and he was also a senior officer in the Islamic Revolutionary Guard Corps, and that "will magnify Iran’s desire to respond by force." In January 2021, Iran told the IAEA that it would enrich uranium to 20%, as it had done before the JCPOA. In February 2021, Iran's Foreign Ministry confirmed that the country has informed IAEA about its plans to reduce the commitments made to the agency, alongside limiting the IAEA's access to Iran's nuclear facilities. Later in February the IAEA confirmed that Iran had begun to produce uranium metal, in contravention of the JCPOA. Iranian leaders have claimed that "the country’s nuclear program has always been intended solely for peaceful civilian purposes." The UK, France, and Germany said that Iran has "no credible civilian use for uranium metal" and called the news "deeply concerning" because of its "potentially grave military implications" (as the use of metallic enriched uranium is for bombs). In March 2021, Iran started enriching UF6 uranium at its underground Natanz plant with a second type of advanced centrifuge, the IR-4, in a further breach of the JCPOA. On 10 April, Iran began injecting uranium hexafluoride gas into advanced IR-6 and IR-5 centrifuges at Natanz, but on the next day, an accident occurred in the electricity distribution network. In May 2021, the IAEA reported that Iran produced 60% highly enriched uranium in limited amounts. Iran said this was in response to the Natanz incident. The head of the IAEA, Rafael Grossi, stated that "only countries making bombs are reaching this level". The New Yorker reported in January 2022