Information from a "credible source" who has direct knowledge of what became of Trevor Deely, the 22-year-old Kildare man who vanished without trace in Dublin nearly 17 years ago, prompted gardai to begin searching woodlands on the city outskirts yesterday.
Mr Deely - originally from Co Kildare - went missing 17 years ago, and it is hoped the search will lead to a breakthrough in the case.
Gardaí launched a complete review of the investigation previous year.
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The file on Trevor Deely has never been closed and there have been a number of appeals for information over the years but Trevor has never been found.
In recent months, gardai have been working to identify a man who was seen outside Trevor's workplace on the night he disappeared. The site search is focused on an area on the Old Lucan Road in Chapelizod, Dublin 20.
Detective Inspector Paul Costello explained that the search got underway this morning, and the area has been sealed off.