Contreras added: "The fact should not be ignored that the dictatorship, in order to avoid the discovery of thousands of crimes, hid bodies, changed the locations of remains, buried others in their place, threw bodies into the sea, burned others".
Rahman was secretly buried; the location of his remains remain unknown.
The Independent Commission for the Location of Victims' Remains believes the remains of another victim, the former monk turned IRA activist Joe Lynskey, are also in Coghalstown bog.
This week the Independent Commission for the Location of Victims Remains confirmed the remains were those of Mr Armstrong after DNA testing was carried out.
"One of the wounds that remains open is the location of the remains of many dead opponents," President Lula admitted.
Sir Ken Bloomfield and Frank Murray, senior members of the independent commission for the location of victims' remains, said: "The results positively indicate that the remains are those of Séamus Wright and Kevin McKee.
On Monday, the Commission for the Location of Victims' Remains said: "The results positively indicate that the remains are those of Mr Gerard Evans.
On Tuesday, the Independent Commission for the Location of Victims Remains (ICLVR) said results of DNA tests confirmed the remains were Mr Wilson's.
Geoff Knupfer, lead forensic scientist at the Independent Commission for the Location of Victims' Remains (ICLVR), said the task ahead remained difficult.
The Independent Commission for the Location of Victims Remains began searching the beach following a tip-off that remains were buried there.
Even though some details of Mr. de Souza's disappearance remained unclear, including the identification and location of his remains, his family cautiously welcomed the announcement that officers would be charged in his killing.
