The U.S. and Britain have denied involvement in the slayings. Israel has neither confirmed nor denied its involvement. “Through this complaint, we declare to the world that actions of arrogant governments, led by the U.S., Britain and the occupying Zionist regime, in assassinating nuclear scientists and elites is against human principles,” according to a statement read by Mansoureh Karami, the wife of slain Tehran University physics professor Masoud Ali Mohammadi.