Question: Among the events that led to the creation of permanent counter-terrorism forces in major European countries were the Black September Organization was responsible for the massacre of Israeli Olympic team members and the assassination of the prime minister of which country?
Sentence (from "Black September Organization"): The Black September Organization (BSO) (Arabic: منظمة أيلول الأسود‎ ‎ , "Munaẓẓamat Aylūl al-aswad") was a Palestinian terrorist organization founded in 1970.
Relevant evidence: No