East Londonderry DUP MP Gregory Campbell is claiming that the republican movement has had a special committee to deal with sex abuse complaints.
Mr Campbell told the House of Commons that the committee operated 13 years ago and dealt with some 100 sex abuse victims.
There had been “very prominent republicans involved in the committee”, he claimed.
However, in a later statement, Sinn Fein called the DUP MP’s allegations “untrue and without basis in fact”.
A Sinn Fein spokesperson said in the statement: “Gregory Campbell’s claims about the existence of a ‘fixed committee’ dealing with cases of abuse in the year 2000 is untrue and without basis in fact.”
Mr Campbell made the comments to Secretary of State Theresa Villiers during Northern Ireland questions in the House of Commons on Wednesday, the BBC reported.
The MP said: “The voluntary sector had an unfair burden in the past, particularly in dealing with sex abuse victims.
“Will the Secretary of State comment on information I have received about a fixed committee that existed within the republican movement in 2000, which dealt with almost 100 sex abuse victims and in which some very prominent republicans were involved, and will she join me in calling for those people to come forward and help those many innocent victims deal with the nightmare they are still dealing with 13 years on?” he asked.
In response, Ms Villiers said: “The honorable Gentleman raises some very grave matters, and I would certainly encourage anyone who has been the victim of abuse to approach the police with that information, and anyone who has knowledge of such cases to do so too.”