Sinn Féin leader Gerry Adams has said it is unlikely that he will continue to cooperate with people looking for information about relatives killed or missing during the violence in Northern Ireland.

This follows the furore over his involvement in efforts by the Stack family to find out who killed their prison officer father.

Brian Stack died 18 months after he was shot in an IRA attack in 1983.

Speaking on RTÉ's This Week, Mr Adams said there had been an agreement between various politicians to deal with legacy issues but that that agreement had been held up because of British security concerns.

He also refused again to name the man described as a trusted confidante of his, who met members of the Stack family in 2013, and who admitted in a statement that the IRA had been behind the killing but that it had been "unauthorised" and the person who ordered the shooting had been sanctioned.

Mr Adams said that he had a confidentiality agreement with that man and would not name him.

He also said that he would not be prepared to approach the man with a view to asking him to come forward voluntarily to speak to gardaí about what he knew.