A man and a woman, aged in their 60s, were arrested on Wednesday
Two people arrested in relation to the murder of Ashling Murphy have been released from custody.
A man and a woman, both aged in their 60s, were arrested on Wednesday on suspicion of withholding information regarding the investigation into the 23 year old Offaly woman's murder.
They were being detained at garda stations in the eastern region, where they could be questioned for up to 24 hours.
The pair have since been released and a file is being prepared for the DPP.