The incident happened on Tuesday night on Eyre Street in Newbridge at around 8.40.
A 65 year old pedestrian was struck by a car and the driver of the vehicle failed to stop at the scene.
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A 28 year old man was arrested at a house in the town last evening in relation to the investigation and is detained at the local Garda station under section 4 Criminal Justice Act.
The injured man remains in a very serious condition in Naas General Hospital.