Gardaí are investigating how three men entered the country as stowaways on a truck bringing equipment to the Galway International Arts Festival.
The three men - believed to be from Sudan - were found in the body of a truck that travelled to Ireland from France this week.
The vehicle was transporting band equipment to the Big Top concert venue.
The men were detained at the Fisheries Field in Galway yesterday afternoon and taken to Mill Street Garda Station.
They have been medically assessed and are said to be in good health.
The Garda National Immigration Bureau has been notified and is processing documentation in connection with the three men.