More than 3,200 statements and reports have been collated as part of the investigation into the murder of Detective Adrian Donohoe.
Garda Commissioner Martin Callinan said the investigation has also led to the recording of over 1,000 exhibits.
The father-of-two was shot in the head outside the credit union in Lordship, on the Cooley peninsula, Co Louth on January 25th as he escorted cash collections from the premises.
The Garda Commissioner provided an update on the investigation when he met PSNI Chief Constable Matt Baggott at a cross Border organised crime conference in Dundalk yesterday,
Mr Baggott rejected any suggestion that his officers were not prepared to pursue criminals in the south Armagh area, where the murder gang is believed to be based.
“There is nowhere we won’t go to bring people to justice,” he said. “We will pursue every avenue, we will spare no resources. We will make sure we support our colleagues here as fully as we can.”
Mr Callinan said along with the statements, more than 3,600 structured lines of inquiry had been established.
Neither Mr Callinan or Mr Baggott would not be drawn on how near or far way investigating officers were from making arrests.
Mr Callinan said: “This is to ensure that this type of crime is, as far as possible, eliminated through effective crime prevention methodologies and ensuring all possible leads are thoroughly and professionally exhausted regardless of where it emanates from, be it north or south of the Border.”
The annual conference is used by senior officers to discuss emerging threats and share knowledge in the context of cross-Border crime.
PA