An agreement was signed on 27 May 2005 by Germany, Spain, France, Luxembourg, Netherlands, Austria, and Belgium at Prüm, Germany. this became known as the Prum Convention.
This agreement, based on the principle of availability which began to be discussed after the Madrid bomb attack on 11 March 2004, could enable them to exchange all data regarding DNA and fingerprint data of concerned persons and to cooperate against terrorism. Furthermore, it contains provisions for the deployment of armed sky marshals on intra-Schengen flights, joint police patrols, entry of (armed) police forces into the territory of another state for the prevention of immediate danger, cooperation in case of mass events or disasters. Furthermore, the police officer responsible for an operation in a state may, in principle, decide inhowfar the police forces of the other states which take part in the operation may use their weapons or exercise other police powers. Sometimes known as the Prüm Convention, this treaty is becoming known as the Schengen III Agreement. It was adopted into EU regulation for Schengen states in June 2007, as far as its provisions fall under the third pillar of the EU. With respect to subject matters which are to be regulated within the first pillar of the EU, the implementation would require an initiative from the European Commission, which enjoys the monopoly on legislative initiative in that pillar. The Commission has not made use of its right to initiative with regard to such content of the Prüm Convention