They have admitted already that some of their people were involved.
No one has said that it was a planned execution.
The killers, who were prominent and high ranking IRA and Sinn Fein officers, were having an off duty drink.

However, when the mutilation of Mr.McCartney began, they assumed their paramilitary roles. They announced that it was IRA business.
Did the statement mention that?
Among the onlookers were relations, friends and neighbours of Mr. McCartney. What authority prevented them from sending for an ambulance for the suffering and dying victim? Any answer to that?

Of course, someone was sent for. A team arrived who appeared to be trained and equipped to forensically clean murder scenes.
Was it denied that they were acting for and on behalf of the Provisional IRA?

Curator, you alone among the Nationalist contributors to this forum sing the praises of these people. Incidents like this give us all a glimpse of the face behind the balaclava.
It is hideous.