Republicans have been protesting over the return to jail of Shankill bomber Sean Kelly.
Shankill bomber Sean Kelly is back in jail
Kelly, convicted of the 1993 bombing that killed 10 people, was freed early under the Good Friday Agreement.
He was returned to jail at the weekend after security information indicated he had become "re-involved in terrorism".
Speaking at a protest outside Hillsborough Castle, Sinn Fein's Gerry Kelly said his jailing amounted to internment without trial.
Sean Kelly was one of two men who planted a bomb in the Shankill Road fish shop. Nine civilians died, as did Kelly's IRA accomplice.
He received a total of nine life sentences but was freed early from prison in July 2000.
Gerry Adams said returning Sean Kelly to jail was stupid
On Saturday, Secretary of State Peter Hain said he was satisfied Kelly had "become re-involved in terrorism and is a danger to others and while he is at liberty" and returned him to jail.
Gerry Kelly said Mr Hain would have some distance to go
before he could "prove to nationalists and republicans he was capable of standing up to the anti-peace process securocrats within his own system".
"Hidden unaccountable accusations by Special Branch and their ilk in the secret intelligence world was supposed to be a thing of the past," he said.
"So was internment without trial."
Speaking in Dublin, Sinn Fein President Gerry Adams said jailing Kelly could discourage other republican ex-prisoners from acting as stewards at Protestant marching season parades.
"The arrest of Sean Kelly is one of the most stupid things that I have heard of in quite a long time," he said.
"Sean Kelly is not a dissident. I know he is a hate figure within Unionism. He's pro the Good Friday Agreement."
Mr Adams said they relied on republican ex-prisoners to steward parades.
"A lot of republican prisoners have said to me in very straight terms that why should they do that and risk their licence being taken from them and sent back to prison," he said.
"That is a very practical difficulty at this time."