Extradition and European Arrest Warrant Act
Chapter three - EXTRADITION PROCEDURE
Title I - Extradition at the request of another state
Article 13
(2) A request for provisional arrest shall specify the existence of an act of detention, arraignment or of a conviction and the intention of the requesting state to file a request for extradition. The request should contain information about the criminal offence in respect of which extradition will be requested, and when and where such offence was committed, as well as a description of the person sought.
Contents of request for provisional arrest
EDIT.