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Terrorism, 1972 Olympic Games in Munich, pic: September 1972, An Arab guerilla of the 'Black September' movement on a balcony waering a hooded face mask (Photo by Popperfoto/Getty Images)

Terrorism, 1972 Olympic Games in Munich, pic: September 1972, An Arab guerilla of the 'Black September' movement on a balcony waering a hooded face mask  (Photo by Popperfoto/Getty Images)