Police in north Wales have until tomorrow to question two Irish based terror suspects.
The 47-year-old man and 44-year-old woman, who are said to live in west Dublin, were arrested under the Terrorism Act at Holyhead Port 10 days ago.
The pair are originally from Algeria.
It is understood the man was detained by Special Branch officers as he arrived on the Isle of Anglesey, on Friday August 11, on a ferry from the Republic of Ireland.
The woman was thought to be waiting for him at the port.
Details of their arrest were not disclosed until Thursday, when North Wales Police successfully applied at Holyhead Magistrates Court to hold the pair for a further five days.
Detectives must decide tomorrow whether to charge the man and woman, free them, or apply to the court for another extension.
A spokesman for North Wales Police said further updates on the arrests would be released tomorrow.
The couple were in possession of several items which have been seized by police. It has been alleged a laptop computer containing bomb-making instructions was discovered.
Police stressed no threat was posed to passengers and staff at Holyhead Port and do not believe the arrests were linked to the alleged airline bomb plot.
It is still not known if the couple are Irish or British citizens, whether they were related or married, or whether any properties had been raided.
Gardai confirmed they have been in contact with North Wales Police.
"We did assist them last week in actions they asked us to carry out, but it is their investigation," a force spokeswoman added.
The Minister for Foreign Affairs Dermot Ahern, warned it was wrong for people to generalise and point the finger at one ethnic group or another.
"It again confirms that while people have to put up with difficult security checks, I think it is being done in such a way to try to preserve life and to safeguard against situations where people are put in danger," he said.
"My department wouldn't normally be aware of these situations unless it is contacted, and to the best of my knowledge we haven't been contacted."
Security has been stepped up at Holyhead, which is a main ferry terminal for services between north Wales and Ireland and includes sailings operated by both Irish Ferries and Stena Line.