IRAN’S president has accused Israel of killing a prominent Iranian scientist long suspected by the West of masterminding a secret nuclear bomb programme, state TV reported. Iran's clerical and military rulers have threatened revenge for Friday's killing of Mohsen Fakhrizadeh, who Iranian media said died in hospital after assassins gunned him down in his car near Tehran. "Once again, the evil hands of global arrogance were stained with the blood of the mercenary usurper Zionist regime," a term for Israel, President Hassan Rouhani said in a statement, according to state TV. "The assassination of martyr Fakhrizadeh shows our enemies' despair…