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Convention (IV) relative to the Protection of Civilian Persons in Time of War. Geneva, 12 August 1949.
Art. 3. Annex I : Draft agreement relating to hospital and safety zones and localities
. -- PROHIBITED ACCESS
This obligation, which follows naturally from Article 1
, calls for no particular comment.
In practice, a fairly large police force will no doubt be required, since there is a risk that, under certain circumstances, unauthorized persons might try to enter the zones in considerable numbers.