The Provisional IRA has said it offered to shoot those who it believed were involved in the killing of Belfast man Robert McCartney but his family made it clear they did not want any physical action taken.

In a statement, the IRA also said it has ordered anyone who was present on the night of Mr McCartney's death to give a full account of their actions.

Meanwhile the envoy of the US President, George W Bush, to Northern Ireland has said Mr Bush was aware of the stand taken by Mr McCartney's sisters and was keen to meet them.

Speaking on RTÉ Radio’s 57Live, Mitchell Reiss said that while he welcomed some of what the Sinn Féin leadership had said at their Ard Fheis last weekend, he wanted the party to go further in its condemnation of criminality.

Mr Reiss added what was needed now was action.

The sisters of Mr McCartney earlier confirmed that they have been invited to visit Mr Bush in the White House on St Patrick's Day.

Speaking outside Leinster House, Catherine McCartney said the family was looking forward to meeting Mr Bush and putting its case for justice following the murder.

But she told journalists the case will not be resolved in the US but in Ireland when the killers come forward and admit their guilt.

She said that despite all the publicity, there has been no real progress in bringing the killers of Mr McCartney to justice.

McCartneys attend Dublin engagements

The sisters and partner of the father-of-two were at Government Buildings today for a number of engagements.

They attended International Women's Day celebrations and met female TDs and senators this afternoon.

In a speech to mark International Women's Day, Justice Minister Michael McDowell said Mr McCartney's killing and what followed showed how some people who masquerade as defenders of a community feel they can carry out any atrocity and intimidate their neighbours to prevent justice being done. 

Still no police breakthrough

Earlier, the sisters said police have not yet received information that would allow them to arrest anyone in connection with their brother's murder. 

However, they said that their campaign to bring his killers to justice had great momentum. 

Mr McCartney was stabbed to death following a row in a pub in Belfast on 30 January.