The Department of Foreign Affairs says it is in "constant touch with the families and the Colombian authorities" about the three suspected IRA members who are being held in Bogota.
An official from the Irish Embassy in Mexico will visit the men in coming days, said a Foreign Affairs spokesman. He said there was no Irish embassy in Bogota, but responsibility for Colombia falls under the remit of the embassy in Mexico.
The three - Mr Niall Terence Connolly, Mr Martin McCauley and Mr James Monaghan - are accused of carrying false passports and of training members of the Revolutionary Armed Forces of Colombia (FARC) to make bombs and other weapons during a five-week stay in a rebel-controlled area. The three have denied the charges.
Meanwhile, Mr Paddy Connolly, brother of Mr Niall Connolly, told RTE radio yesterday he feared for the safety of the men.
He said his brother had managed to get a message to the family, through a woman, that the men's lives were in danger. Mr Paddy Connolly also said "there seemed to be some indication that the men have been targeted".
The spokesman said: "We are aware of the family's concerns and these concerns will be raised - and have been already - with the authorities." Colombia's public prosecutor's office has eight months to prepare its case against the three.
Ruben Aguirre, a prominent FARC rebel commander, was killed on Sunday north of Bogota, an army official announced, AFP reports. Aguirre, also known under his nickname of Alirio, was gunned down near the town of Pauna along with four other FARC guerrillas.