He was arrested yesterday in Belfast by detectives from the PSNI’s Terrorist Investigation Unit.
The suspect detained under section 41 of the Terrorism Act.
He was taken to the serious crime suite at Musgrave PSNI station in Belfast city centre for questioning about the attempted murder of police officers in Lisnaskea, Co Fermanagh and possession of explosives with intent to endanger life on August 16, 2008.
Following, 24 hours of questioning he has now been released from custody.
A file on the investigation will now be forwarded to the PPS for a directing officer to consider whether the case passes the test for prosecution.
During the attack, three police officers cheated serious injury when dissident republicans launched a rocket-propelled grenade which failed to explode.
Two were taken to hospital suffering from severe shock and minor injuries after the attack where they were on foot patrol.
At the time, Chief Supt Michael Skuce said: “This was clearly a case of attempted murder – we could have been dealing with multiple casualties this morning and the devastation that would have caused throughout the community.
“There are a number of families out there who will be counting their blessings that they are not grieving for a loved one.”