Police in Sweden are awaiting blood test results from samples taken from a couple yesterday in connection with the death of newborn baby girl last December.
The man who was arrested is understood to be from Northern Ireland.
The couple were arrested on Sunday afternoon and were released yesterday pending the blood results.
Mr Lars Gromskod, spokesman for Stockholm police, told The Irish Times the couple were arrested at a campsite in the university town of Uppsala about 70 km north of Stockholm.
"They have been released but we have taken their passports and they will not be able to leave the country. We have taken blood samples and we are waiting for the analysis results."
He said the results could take "two days or two weeks" to come back from the police laboratory. The samples are being analysed to see if they match with blood found on a shawl that was swaddling the baby's body.
Mr Gromskod would not give details about what led the police to arrest the couple. However, he said that if the blood samples matched with the blood on the shawl, one or both of the two arrested could be charged with murder.
Police have been conducting a murder investigation since the child, who died a few hours after birth, was found by a couple walking their dog in a pedestrian tunnel in a suburb of Stockholm, on December 21st, 2002.
Mr Gromskod would not give details about the couple, saying only that they were "young" and had been working in Sweden for the past year.
A spokeswoman for the Department of Foreign Affairs in Dublin said there had been no request for consular assistance by the couple.
The British embassy in Stockholm was endeavouring to get in touch with the couple, a spokeswoman said.
Two other people, believed to be a British couple, were initially arrested but subsequently released after tests on blood stains on the baby's shawl did not match those of the woman.
