He is being held at a garda station in the eastern region.
A man in his 20s has been arrested in connection with the assault of a woman in Newbridge.
The woman was found unresponsive at St Conleth's car park on the main street in the town on Wednesday morning.
The woman, who is aged in her 20s, was seriously injured and is continuing to receive treatment at Tallaght hospital.
Kfm understands that she had been stabbed.
The man is being held at a garda station in the eastern region.
Gardaí are continuing their appeal for information and are asking that anyone who was in the area between 11pm on Tuesday night and 8.15am on Wednesday morning to contact them.
Anyone with information is asked to contact Newbridge Garda Station on 045-440180, the Garda Confidential Line on 1800 666 111 or any garda station.

Kfm Obituary Notices
Kildare-Based Animal Rescue Group Continue Calls To Ban Sulky Racing On Public Roads
National Homeless Figures Increased By Almost 200 In February
"It's Ridiculous, We Are Still Back In The Nineties": Concern Over Safety Issues At Athy Train Station Highlighted
Piper’s Hill College Among Schools Awarded National LGBTQ+ Quality Mark
North Kildare Road Closures Planned As Major Water Works Get Underway
Damaged Water Mains In Maynooth To Be Replaced, With Works Commencing Next Week