One hundred people arriving in Dublin Airport have been referred to gardaí for failing to present a valid PCR or antigen test.
Under new Covid travel requirements, which came into effect on Sunday morning, air and sea passengers arriving into Ireland require PCR and antigen testing.
Five of those detained presented false tests, with the majority of those having travelled from Britain on Irish airlines. Ninety-five people had no Covid test results.
The Joint Committee on Transport and Communications heard that in total 80,000 people flew into Dublin Airport in the first 72 hours of the new requirements.