The two men arrested by the PSNI over the loyalist murder of a Sinn Féin councillor across the border in Co Donegal 18 years ago were tonight released without charge.
A 41-year-old man was arrested earlier at Drumahoe near Derry City at the request of the gardaí.
A second man aged 45 was arrested a short time later when he presented himself to a police station in Co Antrim.
Donegal Councillor Eddie Fullerton was shot dead by the loyalist UFF at his home just across the Donegal border in Buncrana.
The two men were questioned at the serious crime suite in Antrim before being released unconditionally, according to the PSNI.
Mr Fullerton's daughter, who has led the campaign to bring her father's killers to justice, welcomed the police action. She said it was movement in the case. It was a development and the first arrests in relation to the murder of her father since he was killed.
'The investigation in the weeks, months and years following dad's murder went nowhere. The family has always felt that, had dad been a councillor for any other party, the killers would have been brought to justice,' she said.
The Fullerton family has consistently claimed that there was State collusion in and a subsequent cover-up of the murder.
Mr Fullerton was shot dead at his home at Cockhill Park in Buncrana, Co Donegal as he confronted his killers in May 1991. The attackers smashed their way into his home using a sledgehammer.
Commenting on the arrests, Northern Ireland Deputy First Minister and Sinn Féin MP Martin McGuinness said that they were down to the persistence and perseverance of Mr Fullerton's family who he said had refused to buy the lies and have campaigned tirelessly for the truth.
Mr McGuinness said Eddie Fullerton had been gunned down in his Buncrana home 18 years ago.
'The loyalist murder gang responsible were allowed to escape and kill again. The Fullerton family have been badly let down by both policing systems north and south in the years since,' he said.
'Despite all of the blockages to justice, the Fullerton's have maintained their dignity and brought their campaign for the truth to every forum in Ireland and beyond.
'It is my hope that these arrests today will mark the beginning of the emergence of the truth surrounding Eddie's murder and the subsequent failure of the guards [gardaí] and the RUC to rigorously pursue his killers.'
Buncrana Sinn Féin Councillor Padraig MacLochlainn, who has spoken to the Fullerton family today, said they were hopeful that these arrests represented a significant breakthrough.
'Sinn Féin will continue to stand shoulder to shoulder with the Fullerton family and provide them with every support and encouragement until they receive justice and establish the truth into the circumstances before and after Eddie's murder,' he added.
