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Convention (IV) relative to the Protection of Civilian Persons in Time of War. Geneva, 12 August 1949.
After the close of hostilities
Internment shall cease as soon as possible after the close of hostilities.
Internees in the territory of a Party to the conflict, against whom penal proceedings are pending for offences not exclusively subject to disciplinary penalties, may be detained until the close of such proceedings and, if circumstances require, until the completion of the penalty. The same shall apply to internees who have been previously sentenced to a punishment depriving them of liberty.
By agreement between the Detaining Power and the Powers concerned, committees may be set up after the close of hostilities, or of the occupation of territories, to search for dispersed internees.
Commentary of 1958