A second man has been arrested in connection with the investigation into the murder of Ashling Murphy.
He was arrested in relation to potential withholding information.
He is believed to be in his 30s and is being detained at a garda station in the eastern region.
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Meanwhile, Gardai are continuing to question a man in his 30s in Tullamore.
He must be either charged or released by this evening
23-year-old Ashling was killed last Wednesday while out for a run at a canal bank near Tullamore, Co Offaly.