A PUBLIC inquiry set up to investigate the murder of Loyalist paramilitary leader Billy Wright has voiced concerns over the Police Service of Northern Ireland's (PSNI) inability to hand over sensitive security files.Loyalist Volunteer Force (LVF) leader Billy Wright was shot dead by INLA gunmen inside the Maze prison in December 1997.Nicknamed "King Rat," Wright and his gang were blamed for the murder of dozens of Nationalists in the mid-Ulster area in the 1980s and 1990s.In 2003 retired Canadian judge Peter Cory recommended a public inquiry into Wright's murder after he uncovered evidence to suggest that elements of the security forces may have colluded in the Loyalist's murder.The three-man Wright Inquiry opened in June 2005 but since then has been dogged by a succession of legal arguments and protracted delays.However, in what is being seen as a sign of growing frustration, the Wright panel this week voiced concerns at the PSNI's failure to hand over sensitive intelligence documents it had requested to study.When the Wright Inquiry was established three years ago PSNI Chief Constable Hugh Orde had pledged that his force would cooperate fully with the investigation.However, frustrated at the lack of PSNI co-operation, the Wright Inquiry this week said, "The PSNI have suggested a number of reasons for any information gap that exists . they are not necessarily accepted by us."The chief constable of the PSNI has stated publicly on a number of occasions that his intent is to facilitate the work of the inquiry to the fullest extent possible. Despite this, the PSNI has been unable to provide the inquiry with a copy of documents it has requested."The panel expressed serious concern that RUC Special Branch had stopped keeping hard-copy records of files since 1994.It expressed further concerns that the PSNI had been unable to provide it with a single force order, internal memo, instruction or training material regarding the changeover from a written to a fully-computerized recording system for intelligence materials.However the PSNI defended its cooperation with the Wright Inquiry, stating, "We have conducted exhaustive searches to deliver material to the inquiry, and a huge amount of effort and resources continues to be dedicated to servicing it."The Wright Inquiry was hit by further problems this week when it was revealed that a barrister due to address the investigation has had a laptop containing confidential information stolen.The computer, belonging to a barrister representing prison service staff due to give evidence at the inquiry, was stolen from the barrister's offices in London.Secretary of State Shaun Woodward is said to view the theft with serious concern.DUP MP Jeffrey Donaldson voiced concern over the theft, but appeared to rule out paramilitary involvement."Perhaps it involves people who don't want certain things coming out at the inquiry," he said."This was a very specific job, carried out by someone who had the task of going into the place and to remove the laptop."