Part II Regional Instruments States Parties. 3. Extradition shall not be granted if final judgement has been passed by a competent authority of the requested State upon the person in respect of the terrorist act or acts for which extradition is requested. Extradition may also be refused if the competent authority of the requested State has decided either not to institute or terminate proceedings in respect of the same act or acts. 4. A State Party in whose territory an alleged offender is present shall be obliged, whether or not the offence was committed in its territory, to submit the case without undue delay to its competent authorities for the purpose of prosecution if it does not extradite that person. Article 9 Each State Party undertakes to include as an extraditable offence any terrorist act as defined in Article 1, in any extradition treaty existing between any of the States Parties before or after the entry into force of this Convention. Article 10 Exchange of extradition requests between the States Parties to this Convention shall be effected directly either through diplomatic channels or other appropriate organs in the concerned States. Article 11 Extradition requests shall be in writing, and shall be accompanied in particular by the following: (a) an original or authenticated copy of the sentence, warrant of arrest or any order or other judicial decision made, in accordance with the procedures laid down in the laws of the requesting State; (b) a statement describing the offences for which extradition is being requested, indicating the date and place of its commission, the offence committed, any convictions made and a copy of the provisions of the applicable law; and (c) as comprehensive a description as possible of the wanted person 214