A 40 year old man has been released from custody in connection with the murder of Prison Officer, Adrian Ismay.
The suspect was detained in Belfast this morning and has been released pending a report to the Public Prosecution Service.
Mr.Ismay died in hospital eleven days after a bomb detonated under his van in East Belfast last March.
The 52 year old suffered serious leg injuries when the booby-trap device exploded.
A 46-year-old man has already been charged in connection with the murder and has been remanded in custody.
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