ICAO Annex 17
5.2.5 Each Contracting State in which an aircraft subjected to an act of unlawful interference has landed shall notify by the most expeditious means the State of Registry of the aircraft and the State of the Operator of the landing and shall similarly transmit by the most expeditious means all other relevant information to:
b) each State whose citizens suffered fatalities or injuries;
c) each State whose citizens were detained as hostages;
d) each Contracting State whose citizens are known to be on board the aircraft; and
e) the International Civil Aviation Organization.
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