A man and a woman are being questioned by gardaí as part of an investigation into human trafficking.
Planned searches in Dublin, Dundalk and Athlone took place as part of Operation Quest.
A man in his 20s and a woman in her early 30s are being held in Clondalkin Garda Station. Another man was detained at Athlone Garda Station, but has been released without charge.
A number of items of evidence have been seized, including mobile phones, electronic devices and documentation.
Operation Quest was launched with the aim of identifying potential victims of human trafficking.
The investigation team is liaising with Europol, Interpol, the PSNI, the Human Trafficking Centre Central Investigations Bureau in Poland and the Serious Organised Crime Agency in the UK.
Anyone with information is asked to contact Store Street Garda Station on 01-6668074/6668000, the Garda Confidential Line on 1800-666-111 or any garda station.