The Provisional IRA has said the organisation was not involved in the killing of Robert McCartney in Belfast on 30 January, but has said that a number of republicans were involved.
The statement says three members have been dismissed from the organisation.
One of the three had made a statement to a solicitor and the two others had been advised to take responsibility for their actions.
The statement goes on to say that any intimidation or threats in the name of the IRA or otherwise to any person who wishes to help the Mc Cartney family would not be tolerated.
Adams holds meeting with McCartney family
The Sinn Féin President, Gerry Adams, has confirmed that he had a face-to-face meeting with the sisters of Robert McCartney.
Speaking in Dublin, Mr Adams said that Mr McCartney's partner, Bridgeen, and his father were also at the meeting, which he described as positive.
He said the republican movement is one of the groups most outraged by the murder of Mr McCartney.
Mr Adams said it was the patriotic duty of everyone to try and help the McCartney family in their desire to have the killer or killers of Mr McCartney brought to justice.
The 33-year-old father-of-two was stabbed to death outside a pub near the city centre on 30 January.
On today's opinion poll, which showed his personal popularity had slumped, Mr Adams said it was a sense of deep disappointment to him.
Separately, the Taoiseach, Bertie Ahern, has said the killers of Detective Garda Jerry McCabe will not secure early release during 'his watch' as Taoiseach.
Mr Ahern made the comments in an interview broadcast this morning on Limerick's Live 95FM.
He said that as far as he was concerned, the early release of the McCabe killers was no longer an issue.
Poll shows SF support almost unchanged
In the Millward Brown IMS poll published in today's Irish Independent, Mr Adams's satisfaction rating was just 31%, down by 20%.
However, the poll also found that support for Sinn Féin is almost unchanged.
The party's poll showing is despite a widespread belief that the IRA was responsible for the Northern Bank raid, and that Sinn Féin and the IRA are 'one and the same'.
Support for Sinn Féin, at 9%, is down just one point on the last comparable poll in November.
Three out of every five voters believe the IRA was responsible for the Northern Bank raid, while 62% say Sinn Féin and the IRA are one and the same.
And 46% believe the claim of the Minister for Justice, Michael McDowell, that senior Sinn Féin leaders were in the IRA.
30% did not believe him, while 24% said they did not know.
More than 1,000 voters, spread across every constituency in the country, were questioned for the poll.
