The "Real IRA" last night staged a show of strength outside the home of Mr Joseph O'Connor, who was shot dead last Friday.
Nine masked and armed "Real IRA" members, including at least two women, fired a volley of shots over a picture of Mr O'Connor, his gloves and combat belt, and a Tricolour. A crowd of around 100 outside the west Belfast house cheered as the shots were fired.
Earlier yesterday, the Provisional IRA denied involvement in the killing of Mr O'Connor, whose funeral will take place in Ballymurphy today amid tight security.
Eyewitnesses, the O'Connor family and the "Real IRA" have blamed the Provisional IRA for the killing. But in a statement to the BBC last night, the Provisionals denied responsibility.
"In light of the speculation and allegations surrounding the killing of Joseph O'Connor the IRA wishes to state that it was not involved in his death. The IRA leadership extends its condolences to the O'Connor family.
"Malicious accusations suggesting IRA involvement are designed to heighten tension and promote the agenda of those opposed to current IRA strategy."
Referring to "Real IRA" threats of retaliation, the statement continued: "Threats directed at the IRA do nothing but exacerbate the situation. The IRA leadership will not be deflected from our current strategy."
In an article in yesterday's Irish News, two former Provisional IRA prisoners, Mr Tommy Gorman and Mr Anthony McIntyre, who are both from the area, said they interviewed eyewitnesses to the event.
The two men stressed their "stringent opposition" to the "Real IRA" but added: "We state publicly that it is our unshakeable belief that the Provisional IRA carried out this assassination."
Mr O'Connor's family has insisted the Provisional IRA was involved.
Tensions are high in west Belfast between mainstream and dissident republicans. The "Real IRA" has threatened to retaliate against those who ordered and carried out the attack.
In a statement, the INLA's political wing, the Irish Republican Socialist Party said Mr O'Connor's killing was a "damning indictment on those who claim to represent mainstream Irish republicanism".