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Convention (XIII) concerning the Rights and Duties of Neutral Powers in Naval War. The Hague, 18 October 1907.
Art. 21. A prize may only be brought into a neutral port on account of unseaworthiness, stress of weather, or want of fuel or provisions.
It must leave as soon as the circumstances which justified its entry are at an end. If it does not, the neutral Power must order it to leave at once; should it fail to obey, the neutral Power must employ the means at its disposal to release it with its officers and crew and to intern the prize crew.