A file has been sent to the Director of Public Prosecutions after one of the "Colombia Three", Niall Connolly, was questioned for hours yesterday in relation to possible passport offences.
Mr Connolly, Martin McAuley and James Monaghan voluntarily arrived at three Dublin Garda stations yesterday by prior arrangement with gardaí.
It is understood the file sent to the DPP relates to all three men.
McAuley and Monaghan were interviewed by gardaí for seven hours before leaving Kilmainham and Terenure Garda stations.
The three men fled Colombia after receiving 17-year sentences for training Farc terrorists.
Connolly was arrested shortly after arriving at Harcourt Terrace Garda station. It is understood he was questioned in connection to allegedly obtaining a false passport in Dublin a number of years ago. He was released shortly after midnight.
All three were convicted in Colombia of using false passports in 2001.
The men were first arrested four years ago and were initially acquitted of charges of training FARC rebels but were sentenced to 17 years in jail last December following an appeal by Colombia's state prosecutor.
Spokeswoman for the Bring them Homecampaign Caitriona Ruane said there was no way the men could be charged by the Irish authorities in connection with the case or returned to Colombia to serve their sentence.
"They were acquitted at the open public trial but they were convicted by judges in a secret court behind closed doors. These men should be left in peace, they have served their time for false documentation and I think anything further now would be unwarranted," she said.
The Colombian government has demanded the return of the three men but the Irish Government has said no extradition treaty exists between the two states, and any possible return is a matter for the courts.