If Member States are unable to reach an agreement within two months on the erasure or rectification of inaccurate or illegally introduced data, the Member State that has not been reported sends the matter to the European Data Protection Supervisor, who acts as a mediator with the relevant national supervisory authorities; For more information on the operation and responsibilities of the national siren office: www.policija.si/eng/about-the-police/organization/general-police-directorate/criminal-police-directorate/sirene In order to strengthen police cooperation in the maintenance of public order and public safety and to prevent criminal offences, the competent authorities can set up joint patrols and other joint operations, i.e. nationals of one Member State participating in operations on the territory of another Member State. Joint investigation teams are seen as an appropriate tool to combat cross-border criminal activity. Joint investigation teams will be set up in accordance with the provisions of the Convention on Mutual Legal Assistance and following an agreement between two or more Member States and other contracting parties for limited purposes and duration. On 9 December 2020, the Commission proposed to strengthen Europol`s mandate to enable the Agency to provide information, analysis and expertise to national law enforcement agencies and to facilitate cross-border police cooperation and terrorism investigations. The Commission has also adopted a proposal to allow Europol to launch reports into the Schengen Information System (SIS) on the basis of information from third countries, including to detect foreign terrorist fighters. The Office provides police cooperation within the Schengen area through the National Siren Office, the Europol National Unit and an International Police Cooperation Department. International police cooperation with non-Schengen states is provided by the Central Office of the National Channel of Interpol and the network of police attachés and police liaison officers. In addition to the exchange of information through the Office`s one-stop shop, requests for cross-border police cooperation can also be made to police cooperation centres (CPC) set up at borders with neighbouring countries, with the exception of Ukraine.