The Black September Organization (BSO) (Arabic: منظمة أيلول الأسود‎, Munaẓẓamat Aylūl al-Aswad) was a Palestinian militant organization founded in 1970. Besides other actions, the group was responsible for the assassination of the Jordanian Prime Minister Wasfi Tal, and the Munich massacre, in which eleven Israeli athletes and officials were kidnapped and killed, as well as a West German policeman losing his life, during the 1972 Summer Olympics in Munich, their most publicized event. These attacks led to the creation or specialization of permanent counter-terrorism forces in many European countries. The group was last known to be active around 1988.