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Convention (IV) relative to the Protection of Civilian Persons in Time of War. Geneva, 12 August 1949.
Notification of measures taken
Immediately upon interning protected persons, the Detaining Powers shall inform them, the Power to which they owe allegiance and their Protecting Power of the measures taken for executing the provisions of the present Chapter. The Detaining Powers shall likewise inform the Parties concerned of any subsequent modifications of such measures.
Commentary of 1958