Northern Ireland's senior police officer believes the IRA still exists, Ulster Unionist leader Mike Nesbitt has claimed.
Mr Nesbitt said Sinn Fein's credibility was "in tatters" following the shooting dead of Kevin McGuigan in east Belfast.
He met Police Service of Northern Ireland (PSNI) chief constable George Hamilton on Saturday.
Mr Nesbitt said: "The Chief Constable repeated the police assessment that members of the IRA took part in Wednesday's murder and that the IRA still exists, although what form it takes in 2015 is not fully clear.
"What is clear is that Sinn Fein's credibility on this issue is in tatters."