The coroner for the Kingsmills massacre inquest has appealed for witnesses and information on the atrocity.
Ten Protestant workmen were cut down in a hail of bullets by a south Armagh roadside in 1976 in a shooting blamed on the IRA.
Speaking at a preliminary hearing in Belfast on Thursday, coroner Brian Sherrard asked for witnesses to the atrocity or anyone who has information about it to come forward now.
Solicitor John McAtamney, acting on behalf of some families of those murdered, said it was also disclosed that the Garda is to disclose further information within days about the killings – which were planned and executed from the Republic of Ireland.
The legal representative for the PSNI said that there were a lot of public interest immunity issues, regarding potential withholding of intelligence information from the hearings.
Also at the hearing, the sole survivor of the massacre, Alan Black, was refused legal representation at the inquest, which is due to open in April. His solicitor, Kevin Winters, said no reasons were given by the coroner on Thursday.
“We await reasons and will consider our next step before deciding what to do next,” he said.
The next hearing will take place on December 17.