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Six terrorists took over the OPEC headquarters in Vienna, Austria, on December 21, 1975, and held dozens of people hostage, including several OPEC oil ministers. Here, the attackers are seen boarding a DC-9 aircraft they had demanded to fly them to Algeria. Mediators from the Interior Ministry stand at center as an armed terrorist boards the plane. Three people were killed in the initial attack, but after negotiations, all remaining hostages and terrorists walked away just days later. (Photo by Bettmann Archive/Getty Images)
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