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"): These events led to the creation of permanent, professional, and military-trained counter-terrorism forces of major European countries, like GSG9 and GIGN, and the reorganization and specialization of already standing units like the Special Air Service of the UK.
Relevant evidence: Yes