The suspected Islamic State extremist arrested in Dublin this week is not an Irish national, but has been living in Dublin for a number of years.
The man, who is in his 30s, is originally from an Eastern European country. He was sent back to Ireland from Turkey last Friday due to "irregularities" on the passport he had used at the airport in Istanbul.
Sources said that he was likely to be charged with offences not directly linked to terrorism after the DPP reviews a file on the matter, which is currently being prepared by investigating gardai.
The passport - which is from an Eastern European EU member state - has been seized by gardai.
Monday's arrest is not the first time this year that a suspected jihadi has been arrested in Ireland.
Last January, a suspected extremist was arrested at Dublin Airport as he attempted to enter the country.