The two men arrested in connection with the murder of Denis Donaldson have been released without charge.
The men, a 69 year old from Dungloe and a 31 year old from Annagry, had been in custody at Letterkenny Garda Station since Tuesday evening.
A file on the men’s arrest will now be compiled and sent to the Director of Public Prosecutions.
The 69 year old had been living in Glasgow for the past number of months but was arrested on Tuesday evening in Glenties.
The other man was arrested in Annagry on Tuesday night on suspicion of being in possession of a firearm on the day that Mr Donaldson was murdered on April 4th, 2006.
Former Sinn Féin official 56-year-old Dennis Donaldson, who had admitted being a British agent for more than 20 years, was shot dead in his remote home at Cloghercor, Doochary, Glenties in 2006.
Earlier this week the family of Mr Donaldson claimed the British security services may hold the key to solving the crime.
Mr Donaldson’s family claim British state agencies, particularly Special Branch, were “central to the murder”.
They said they were increasingly frustrated and concerned by the lack of progress in the Garda murder inquiry, claiming they haven’t met officers since 2009.