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Convention (IV) relative to the Protection of Civilian Persons in Time of War. Geneva, 12 August 1949.
Non-repatriated persons V. Ground for internment or assigned residence. Voluntary internment
The internment or placing in assigned residence of protected persons may be ordered only if the security of the Detaining Power makes it absolutely necessary.
If any person, acting through the representatives of the Protecting Power, voluntarily demands internment and if his situation renders this step necessary, he shall be interned by the Power in whose hands he may be.
Commentary of 1958