The Colombian army says it has arrested a fourth man suspected of being a member of the IRA.
The man, whose identity is unknown, was arrested today in Colombia's southern Huila Province, a military source told Reuters news agency.
"We have arrested an Irishman. We are investigating if he is a member of the IRA," the source said, without providing more information.
A British Embassy official in Bogota told Reuters he was unaware of the arrest.
It comes less than two weeks after the arrests of three other Irishmen, suspected of being IRA members training FARC guerillas in the region.