The ICRC has a legal right to visit anyone captured in relation to an international armed conflict, including situations of occupation, on the basis of the Geneva Conventions and their Additional Protocols (GC III, arts 9 and 126, GC IV, arts 10 and 143, AP I, art. 81).
If violence continues after the end of occupation, the ICRC’s protection activities may have the following legal bases:
In non-international armed conflicts, the ICRC bases its detention activities on article 3 common to the four Geneva Conventions (and Additional Protocol II, where applicable). Article 3 establishes the ICRC’s right to offer its services to the parties to the conflict with a view to engaging in relief action and visiting persons detained for reasons related to the conflict.
In other situations of internal violence, which fall short of armed conflict, the ICRC may offer its services based on its right of initiative laid down in the Statutes of the International Red Cross and Red Crescent Movement (articles 5(2)(d) and 5(3)).
Source : Icrc