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Convention (IV) relative to the Protection of Civilian Persons in Time of War. Geneva, 12 August 1949.
Upon the outbreak of a conflict and in all cases of occupation, each of the Parties to the conflict shall establish an official Information Bureau responsible for receiving and transmitting information in respect of the protected persons who are in its power.
Each of the Parties to the conflict shall, within the shortest possible period, give its Bureau information of any measure taken by it concerning any protected persons who are kept in custody for more than two weeks, who are subjected to assigned residence or who are interned. It shall, furthermore, require its various departments concerned with such matters to provide the aforesaid Bureau promptly with information concerning all changes pertaining to these protected persons, as, for example, transfers, releases, repatriations, escapes, admittances to hospitals, births and deaths.