In what has been the most intense week of the trial of three Irishmen facing charges of schooling Colombian FARC guerrillas in bomb-making skills, the Bogota court heard until late on Thursday night from an alibi witness for one of the defendants.
Mr Mike Ritchie, who is director of Coiste na h-Iarchimí, a support group for republican ex-prisoners and their families, began testifying early on Thursday afternoon.
One of the accused, Mr Jim Monaghan, worked for Mr Ritchie's organisation in the late 1990s.
Mr Ritchie provided the court with three videotapes showing Mr Monaghan participating in workshops on peace-building and reconciliation on dates when the prosecution says he, together with Mr Martin McCauley and Mr Niall Connolly, were teaching FARC rebels in the jungles of Colombia.
He also provided a number of sworn affidavits in which people working with the organisation testify that Mr Monaghan was in Ireland at the time he was allegedly in Colombia.
According to Colombian military intelligence sources, the three had spent several weeks in a FARC-controlled enclave in southern Colombia during February 2001.
The videotapes, two of which were shown to the court late on Thursday night, show the defendant attending a public-speaking workshop in Belfast on February 21st and 22nd, 2001.
Another video, shown to the court yesterday morning, shows him introducing a talk about Colombia to a group in Dublin on February 7th.
In that video he mentions his interest in the peace process in Colombia.
While the witness was presenting affidavits to the judge, Mr Jairo Acosta, the prosecuting lawyer, Mr Carlos Sánchez, interrupted to ask him to clarify that such documents had a legal validity in Colombia.
After a legal debate lasting more than 20 minutes, Mr Acosta ruled in favour.
The men, if convicted, could face up to 20 years in prison for the more serious offence of training the FARC in arms technology. The men have admitted using false passports, a crime which carries a light sentence or deportation in Colombia.
This four-day phase of the trial, which began last Tuesday, has heard from most of the defence witnesses.