In 2020, Iran’s counter-intelligence agencies were challenged by the assassination of Mohsen Fakhrizadeh, the country’s top physicist and the leader of its nuclear program. Iranian officials have described the assassination as an attempt to sabotage Iran’s nuclear energy ambitions. It was initially thought that Fakhrizadeh had been killed in an assault on his car by gunmen using automatic firearms and explosives, but it later emerged that the Iranian scientist had been assassinated by means of a remote-controlled machine gun. Iranian authorities have traditionally blamed similar assassinations on the Forqa Group and the Mojahedin-e-Khalq, the two major anti-regime armed groups; instead, Tehran implicated Mossad, Israel’s intelligence service, in Fakhrizadeh’s killing, publicly admitting to Israel’s ability to strike deep within Iran for perhaps the first time.