A man in his 60s who was being questioned by the Garda Cold Case Review Team investigating the murder of Baby John in Co Kerry almost 40 years ago has been released without charge.
A file will now be prepared for the Director of Public Prosecutions.
He was released at 1.30am from Listowel Garda Station.
A woman in her 50s who was arrested in connection with the same investigation was released yesterday.
Baby John's body was found with 28 stab wounds on White Strand in Cahersiveen in April 1984.
Thursday night's arrests were described as a significant development in the cold case review of the investigation by lead investigator Superintendent Flor Murphy.
Supt Murphy said gardaí are focused on establishing the truth of what happened to Baby John in what became known as the Kerry Babies case.
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At the launch of the cold case review in January 2018, Supt Murphy said it was the strong belief of the investigating team that the answers to the questions about Baby John's death lay in Cahersiveen and the close surrounding area.
It is understood the investigating team still holds to that belief.
Read more: Forensic science key to solving Kerry Babies case
Speaking before mass at Daniel O'Connell Memorial Church in Cahersiveen, parish priest Fr Larry Kelly spoke of the developments in the case and he appealed for empathy and compassion for those involved.
"There is a lot of sadness and grief in south Kerry about this case, which is understandable about anything that remains without a conclusion," he said.
Fr Kelly said there was a lot of fear, shame and moral judgement at the time in 1984 when the five-day-old body of Baby John was found.
He said there was very little help or advice available then and asked people not to judge people involved in the case.
The Taoiseach gave his response to the arrests as he arrived at the second day of an EU summit in Brussels.
"This is a case that's never been closed, and I understand gardaí have made some arrests now. It is a live investigation so probably best for me not to say too much about it," said Leo Varadkar.
"But [it's] a really tragic case that I think everyone in the country is familiar with and the gardaí have continued to investigate."
Tánaiste Micheál Martin said he hopes there will be justice for Baby John and closure for everybody involved.
Speaking in Charleville, Co Cork, Mr Martin described the case as "shocking" and said he awaits the outcome of the garda investigation.
"I can remember as a young person when the case emerged first," he said.
Minister for Justice Simon Harris said it is a "pivotal moment" in the investigation and he would encourage anyone with any information to come forward.
With additional reporting by Conor Kane
