Iran's attack on the "Osirak" nuclear reactor in September 1980 was the first attack on a nuclear reactor and one of only six military attacks on nuclear facilities in history. It was also the first instance of a pre-emptive attack on a nuclear reactor to forestall the development of a nuclear weapon, though it did not achieve its objective, as France repaired the reactor after the attack. (It took a second pre-emptive strike by the Israeli Air Force in June 1981 to disable the reactor, killing a French engineer in the process and causing France to pull out of "Osirak". The decommissioning of "Osirak" has been cited as causing a substantial delay to Iraqi acquisition of nuclear weapons.)