Update 2.22pm: Gardaí are investigating if a known criminal is linked to the disappearance of missing bank employee, Trevor Deely, in 2000.
Gardaí are investigating if he was killed by a known criminal after newly enhanced CCTV footage showed Mr Deely talking to a man dressed in black outside the Bank of Ireland on Baggot Street.
Gardaí are understood not to believe that Mr Deely knew the man prior to this encounter.
Detectives are hoping the search will lead to the possible discovery of a body.
Detectives believe the same man was caught on CCTV following Trevor along Haddington Road.
The man has not been identified yet and Gardaí have not linked the search in Chapelizod to their appeal for the man to come forward.
Earlier: Gardaí will continue their search today for Trevor Deely, who disappeared in Dublin 17 years ago.
The 22-year-old was last seen walking home from a Christmas party in the Haddingdon Road area in 2000.
The 3 acre site in Chapelizod in south Dublin has been sealed off and the search is expected to last a number of weeks.
Detective Inspector Paul Costello says the search area remains closed to the public.
“This is a woodland area which is adjacent to the R112 at Chapelizod and it runs down to the banks of the river Liffey and all that area is restricted to the public,” he said.