2. If a State Party which makes extradition conditional on the existence of a treaty receives a request for extradition from another State Party with which it has no extradition treaty, the requested State Party may, at its option, consider this Convention as a legal basis for extradition in respect of the offences set forth in article 3. Extradition shall be subject to the other conditions provided by the law of the requested State Party.
3. States Parties which do not make extradition conditional on the existence of a treaty shall recognize the offences set forth in article 3 as extraditable offences between themselves, subject to the conditions provided by the law of the requested State.
4. If necessary, the offences set forth in article 3 shall be treated, for the purposes of extradition between States Parties, as if they had been committed not only in the place in which they occurred but also in a place within the jurisdiction of the State Party requesting extradition.
5. A State Party which receives more than one request for extradition from States which have established jurisdiction in accordance with article 7 and which decides not to prosecute shall, in selecting the State to which the offender or alleged offender is to be extradited, pay due regard to the interests and responsibilities of the State Party whose flag the ship was flying at the time of the commission of the offence.
6. In considering a request for the extradition of an alleged offender pursuant to this Convention, the requested State shall pay due regard to whether his rights as set forth in article 7, paragraph 3, can be effected in the requesting State.
7. With respect to the offences as defined in this Convention, the provisions of all extradition treaties and arrangements applicable between States Parties are modified as between States Parties to the extent that they are incompatible with this Convention.
ARTICLE 12
1. States Parties shall afford one another the greatest measure of assistance in connection with criminal proceedings brought in respect of the offences set forth in article 3, including assistance in obtaining evidence at their disposal necessary for the proceedings.
2. States Parties shall carry out their obligations under paragraph 1 in conformity with any treaties on mutual assistance that may exist between them. In the absence of such treaties, States Parties shall afford each other assistance in accordance with their national law.
ARTICLE 13
1. States Parties shall co-operate in the prevention of the offences set forth in article 3, particularly by:
(a) taking all practicable measures to prevent preparations in their respective territories
for the commission of those offences within or outside their territories;
(b) exchanging information in accordance with their national law, and co-ordinating administrative and other measures taken as appropriate to prevent the commission of offences set forth in article 3.
2. When, due to the commission of an offence set forth in article 3, the passage of a ship has been delayed or interrupted, any State Party in whose territory the ship or passengers or crew are present shall be bound to exercise all possible efforts to avoid a ship, its passengers, crew or cargo being unduly detained or delayed.
ARTICLE 14
Any State Party having reason to believe that an offence set forth in article 3 will be committed shall, in accordance with its national law, furnish as promptly as possible any relevant information in its possession to those States which it believes would be the States having established jurisdiction in accordance with article 6.
9