Northern Ireland’s Police Ombudsman has been granted permission to seek a full judicial review over claims that the PSNI are refusing to provide his office with access to information linked to 60 murders.
It was claimed during today's hearing in Belfast's High Court that officials of the Ombudsman's Office have been turned away from PSNI stations when seeking information.
The Ombudsman says there have been 100 instances when requests for information have not been granted.
It is understood the Ombudsman has been seeking access to sensitive information about the use of informers and intelligence.
It was stated during proceedings that some of the Ombudsman's requests are linked to alleged criminal behaviour by PSNI officers.
Families of murder victims from The Troubles and their legal representatives, including Raymond McCord whose son was murdered by loyalist paramilitaries in 1997 and a lawyer representing the families of six men shot in a pub in Loughinisland while watching the 1994 World Cup, were present in the High Court during the three hour hearing.
High Court judge Mr Justice Treacy said it is unprecedented to have one public authority taking a judicial review against another one.
The case is next due for mention in two weeks time and in the intervening period it is expected there will be efforts by the PSNI’s Chief Constable and the Police Ombudsman to resolve the row.