Gardai have arrested a man under an extradition warrant in connection with alleged offences in Germany.
The 37-year-old Nigerian was arrested shortly before 4 p.m. on Dublin's south side. A premises was also searched in relation to what gardai described as a "mutual assistance request from the UK authorities."
A spokesman for Scotland Yard told ireland.comthey were anxious to interview the man over the discovery of a boy's torso in the River Thames two years ago.
The boy's torso was spotted in the Thames by a man walking across Tower Bridge on September 21st, 2001. It had been in the water for up to 10 days.
Last March Metropolitan Police officers on the case travelled to Nigeria to chase up new vital leads after forensic evidence revealed that the boy, who detectives named Adam, came from a specific region there.
In April former South African leader Mr Nelson Mandela also made an impassioned worldwide appeal for anyone with information about Adam to come forward.
But despite extensive inquiries, British police have so far been unable to identify the boy.
The man is expected to appear in court later according to a garda spokeswoman.