GARDA Commissioner Martin Callinan has said that his officers are pursuing more than 1,000 lines of inquiry in the hunt for the killers of Detective Garda Adrian Donohoe.
Speaking two weeks after the father of two was gunned down during a raid on a credit union in Co Louth, Mr Callinan said that gardai will not give up until Det Garda Donohoe's killers are behind bars.
Asked if gardai had definite information on those involved in the killing, he said that investigators were "not ruling anything out" and still had several lines of inquiry that they were pursuing.
And he appealed to anyone who was shielding the suspects to give them up, but said that detectives would solve what he dubbed "a cold-blooded murder" with or without their help.
Mr Callinan outlined the scale of the ongoing investigation, which involves up to 150 officers, saying there were:
• 1,125 "structured lines of inquiry".
• Over 360 statements taken.
• More than 300 potential items of evidence.
• Around 140 pieces of CCTV footage being examined.
He said he had received a "thorough briefing" by investigation officers and said the inquiry was "very painstaking", adding: "The level of detail that I have received is, to say the least, extremely impressive."
He said the resources available to his officers in the manhunt was "not an issue" and "never will be".
Asked if he was happy with the progress being made to find the killers, he said: "The progress is steady," adding: "We don't intend to rush matters."
And asked if any individual suspects had been identified, he said: "We're not at this stage ruling anyone in or out."
He said that his officers were working with the PSNI and that inquiries had been made beyond the island of Ireland as well.
"We're keeping all of our options open at this point," he said.
"We're compiling suspects and we will pursue every single avenue and every single suspect until we're satisfied we've ruled them in or out."
Mr Callinan said: "Every single day and every single hour of the day there are new threads of inquiry coming to our attention.
"There is a huge commitment here in the incident room in Dundalk to bring the perpetrators of this dreadful crime to justice."
He added: "There are people out there who know who these people are. Now is the time to come forward and now is the time to help us, not later on when it's too late, when we have our business done."