The Foreigners and Borders Service (Serviço de Estrangeiros e Fronteiras or SEF) was a police agency responsible for border control and immigration management until it was abolished in October 2023. Its functions were transferred to other entities, such as the Agency for Integration, Migration and Asylum (Agência para a Integração, Migrações e Asilo or AIMA) and the police forces, following a restructuring intended to separate administrative services from security enforcement.