The family of an Icelandic man, who went missing in Dublin five years ago, have said there has been "no trace" of him since he disappeared.
Jon Jonsson left the Bonnington Hotel on the Swords Road in Whitehall at around 11am on Saturday 9 February 2019.
He was last seen a short time later walking passed the entrance to Highfield Hospital and heading in the direction of the Collins Avenue junction.
There has been no trace of the then 41-year-old since that day.
Mr Jonsson had been in Ireland with his fiancée to attend a poker tournament and for a holiday.
He arrived in Dublin on Friday 8 February and Jana Gudjonsdottir arrived the following day.
Mr Jonsson is described as being 1.82m (6ft) tall, of medium build, with short brown hair.
His sister Anna Hildur and brother David Karl have travelled to Dublin to join gardaí in making a fresh appeal for information.
Ms Hildur described her brother as "the rock of the family" and she said he was "like a second dad" to her and her siblings.
She said his disappearance "is a mystery" and she said her brother "had plans for his life".
"There has been no trace at all," she added.
In an interview with RTÉ News, David Karl described the last five years as "a rollercoaster of emotions for the family".
He said the disappearance of his brother was "out of character" for Jon.
Mr Karl said the family is "very optimistic about the future" and he said they "really hope that something good comes out of being here".
"We will do whatever it takes to just keep the case going and hopefully get some kind of closure," he said.
Ms Hilkdur said: "Of course we hope he's alive and he would just come with his tail between his legs but for my part, I think it's not like that.
"I just want to find him, find what happened so we can all say goodbye because it's hard to say goodbye if someone is not all gone."
Mr Karl said: "Whatever happened, happened, and from my part, I'm ready to deal with whatever it is."
"But for our sake, and just the way we operate as a whole, we need some kinds of answers," he added.
They both said regardless of whatever happened to Jon, they now just want to bring their brother home.
Over 270 lines of inquiry followed
When last seen, Jon Jonsson was wearing a black padded jacket.
He left the Bonnington Hotel without his passport, wallet and phone, but he was in possession of a key card for his hotel room when he went missing.
Gardaí say they have followed over 270 lines of inquiry, taken numerous statements and reviewed hours of CCTV footage, as part of the investigation to date.
But despite extensive searches and the ongoing investigations, which are being led from Ballymun Garda Station, Jon has not yet been located.
Gardaí say during the course of the inquiry, "the investigation team has received two items of anonymous correspondence, the contents of which have been assessed".
The investigation team has appealed to the author or authors of the correspondences to make direct contact with them.
They say any contact "will be dealt with in the strictest confidence".
Superintendent Darren McCarthy from Ballymun Garda Station said the investigation team is looking for the assistance of the person or people who sent the correspondence "to see can it assist in the lines of inquiry that we've conducted".
Asked if gardaí believe something sinister happened to Mr Jonsson, Supt McCarthy said the case "is being treated as a missing person at the moment and we're following our lines of inquiry in relation to it".
Anyone with any information or who can assist in locating him is asked to contact Ballymun Garda Station on 01 6664400, the Garda Confidential Telephone Line 1800 666 111 or any garda station.
A team from RTÉ Documentary on One, together with Icelandic national broadcaster RÚV, have been recording a podcast on the disappearance of Jon Jonsson.
