GARDAI investigating the murder of Detective Garda Adrian Donohoe raided a house near the border on Friday last and seized mobile phones and a laptop.
Garda Donohoe was murdered outside Lordship Credit Union on Friday night 25 January.
Gardai are investigating mobile phone calls made on the night of the murder.
A significant amount of evidence has been gathered by gardai but it is believed there is not enough at the moment to extradite the gang members to this jurisdiction.
A gang of five from south Armagh is suspected of carrying out the murder and credit union robbery on that night.
If they are arrested they will be questioned by the Police Service of Northern Ireland.
If they were extradited gardai would not be allowed to question them before they would be taken to court.
But so far, no one has come forward with substantial evidence.
Two men were questioned last month by gardai about the theft of the car believed to have been used by the gang on the night of the murder.
The car had been taken from Clogherhead three nights earlier by a gang of thieves and breakers based in the Dundalk area.
The largest number of gardai ever to assemble in the history of the state, came to Dundalk for Detective Garda Donohoe’s funeral.
A total of 4,000 marched in his honour.
They marched to and from St Joseph’s Redemptorist Church and lined the route to Lordship, along with the people of Dundalk, to Adrian’s final resting place.