A funeral ceremony for Iran's top nuclear scientist, Mohsen Fakhrizadeh, in Tehran on Monday. Iranian Defense Ministry/Handout/Anadolu Agency via Getty Images Iran's top nuclear scientist was killed with a remote-controlled machine gun, the country's semiofficial Fars news agency reported. Mohsen Fakhrizadeh, who was seen as the father of Iran's nuclear program, was killed while driving with his wife and security convoy near Tehran on Friday. Fars said the gun was mounted on the back of a Nissan truck that self-destructed after a three-minute attack.