Feared predator Philip Murphy has been released from custody after questioning over the false imprisonment of two women in Dublin.
Gardai have begun preparing a file for the Director of Public Prosecutions (DPP) as part of their investigation.
Murphy (35), from Clondalkin, who was released from Arbour Hill prison less than a month ago, was arrested earlier this week.
He received a 10-year sentence in 2009 for kidnapping a woman a year earlier.
In the most recent investigation, it was alleged that Murphy was responsible for two incidents of false imprisonment of women.
He was held and questioned at Store Street Garda Station following his arrest outside a hostel on Gardiner Street in Dublin's north inner-city on Thursday morning.
It is understood he was quizzed about alleged attempts to abduct women in the Drumcondra area.
Murphy was jailed following his conviction for falsely imprisoning a Polish woman in Clondalkin on June 7, 2008.
Dublin Circuit Criminal Court was told he was nominated as a suspect on the basis of his modus operandi.
Judge Frank O'Donnell said that during the trial it had been put to Murphy, who denied the charges, that he had been "scouring the countryside looking for a victim", but noted that he could only deal with the evidence before him.
He imposed a 10-year sentence for the false imprisonment offence and a three-year sentence for producing a knife.
After his release from prison, a source said gardai would have to closely monitor Murphy - who previously sliced a taxi driver's neck with a bottle and left him with life-threatening injuries - because of his violent past.
He was not officially monitored by gardai because he is not registered as a sex offender.