Martin Corey case may go to European Court
The European Court is to be asked to challenge a decision to overturn a ruling that a convicted double murderer should be released from prison.
Two weeks ago, a judge ruled that Martin Corey, 61, from Lurgan should be freed on bail.
However, the secretary of state has successfully appealed that decision.
Corey was released from prison in 1992 after serving 19 years for the IRA murder of two police officers.
Two years ago, the then Secretary of State Shaun Woodward, sent him back to jail on the basis of what he called "closed material".
Details of the information were not released, but it is known the decision to revoke his licence was connected to allegations of "operational activity within the Continuity IRA".
Earlier this month, a High Court judge ruled that Corey's detention was a breach of the Human Rights Act and ordered his release on unconditional bail.
But that decision was overturned after an appeal by Northern Ireland Secretary Owen Paterson.
Another High Court hearing is to be held in September.
On Wednesday, Republican Sinn Fein launched a campaign to highlight the case.
Party president Des Dalton said Corey's legal team was now considering an appeal to the European Court.
"In terms of taking a challenge to this to Europe, first of all they are going to have to take a challenge to the British Supreme Court, the law lords, because they have to, basically, exhaust the so-called domestic legal machinery before that can be done," he said.
"But my understanding is that that will be the next stage in the process."