He's the second person detained in this country with links to one of the attackers
Gardaí are continuing to question a man in his thirties arrested in Wexford yesterday over the London attacks.
Local media reports that heavily armed guards surrounded the man's place of work prior to his arrest.
He's the second person detained in this country with links to the Irish-based terrorist Rachid Redouane.
He lived in the Rathmines area of Dublin after his application for asylum in Britain was rejected in 2009.
A friend who knew him and his wife said it seemed like a loveless marriage of convenience.
"She was very much on her own, having her baby and bringing her up," the source told the media. "I wasn't quite sure at any point if they were together on a permanent basis, or if they'd separated
"She seemed to be very lonely, all on her own, bringing up the child. I don't think he was stepping up to the mark as a husband."
Rachid Redouane's arrival via Dublin has fuelled concerns that jihadists could use Ireland as a gateway for further acts of terrorism.
Dr Umar Al Qadri, Imam at the Islamic Centre of Ireland, said: "Anyone from Britain can very easily travel to Ireland under the radar by travelling to Belfast and at Belfast airports as well as the port, there is no passport controls.
"These individuals can then just take the bus and go to Dublin so it's very easy for them to come to Dublin, come to Ireland and then stay under the radar."
Gardaí do monitor a small number of people, but confirmed that Redouane was not on their watch list.
A man was also arrested in Limerick on Monday night, but was later released.