A 40-year-old man arrested by detectives investigating the dissident republican murder of prison officer Adrian Ismay in east Belfast almost a year ago is to be reported to prosecutors.
Mr Ismay, a married father-of-three, died last March, 11 days after suffering serious leg injuries when a bomb exploded underneath his Volkswagen Transporter van in east Belfast.
A dissident republican group calling itself the New IRA claimed to have carried out the attack on the long-serving officer.
The suspect was arrested on Monday morning by detectives from the PSNI’S Terrorist Investigation Unit which has been probing Mr Ismay’s murder.
He was later released pending a police file being sent to the Public Prosecution Service.
The PPS will assess whether a prosecution should be taken against him based on the police file.
Mr Ismay was released from hospital after the blast on March 4 and had reportedly been making good progress, but he died unexpectedly less than two weeks later when a blood clot triggered a heart attack.
The results of a post-mortem examination led detectives to open a murder investigation.
One man has already been charged with murder.
Mr Ismay worked at Hydebank Wood Young Offenders Centre in south Belfast, where he trained new recruits to the Northern Ireland Prison Service (NIPS).