Supported reports state that Israeli Prime Minister Benjamin Netanyahu urged US action against Iran for decades, that a joint US-Israeli operation began in late February and ended with a ceasefire in April, and that Ayatollah Ali Khamenei was killed on the first day of the conflict. Former Israeli intelligence analyst Danny Citrinowicz described the outcome as a colossal failure of Israeli strategy. Separate unverified reports claim Iran attempted to assassinate one of Netanyahu's sons.