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Convention (IV) relative to the Protection of Civilian Persons in Time of War. Geneva, 12 August 1949.
Location of places of internment. Marking of camps
The Detaining Power shall not set up places of internment in areas particularly exposed to the dangers of war.
The Detaining Power shall give the enemy Powers, through the intermediary of the Protecting Powers, all useful information regarding the geographical location of places of internment.
Whenever military considerations permit, internment camps shall be indicated by the letters IC, placed so as to be clearly visible in the daytime from the air. The Powers concerned may, however, agree upon any other system of marking. No place other than an internment camp shall be marked as such.
Commentary of 1958