Article 5
In the following cases, each Member State shall take the necessary measures to eliminate the offenses referred to in Article 4, under its jurisdiction:
(a) when the offenses are committed in the territory of its jurisdiction or on board a ship or aircraft registered in that State;
2. In the case of article 13, paragraph (a) or (c), the Court may exercise its jurisdiction if one or more of the following States are Parties to this Statute or have accepted the jurisdiction of the Court in accordance with paragraph 3:
(a) The State on the territory of which the conduct in question occurred or, if the crime was committed on board a vessel or aircraft, the State of registration of that vessel or aircraft;