Relatives of the 10 Protestant workers gunned down in the infamous Kingsmills massacre are to meet police again to press for a fresh investigation of the case.
The bereaved families held separate talks with Secretary of State Owen Paterson, who said he could not intervene on their behalf, before they met with a senior police officer.
The pressure from the relatives comes after a report by the Historical Enquiries Team (HET) confirmed the IRA was responsible for the murders and noted the original police investigation had missed opportunities.
The families, accompanied by Ulster Unionist Danny Kennedy, presented Assistant Chief Constable Drew Harris with a file which they believe supports their calls for a fresh police probe.
The ten men were forced from their bus as they returned home from work and were identified as Protestants before up to 11 republican gunmen opened fire on them in the south Armagh attack, 35 years ago.
Mr Kennedy said the families had fought for decades to secure the information on the case that was uncovered by the HET, but he said they would continue to press for further action.
"We have had some progress," he said of the latest meetings.
"We are obviously still in discussions with the PSNI. It has been taken very seriously by the PSNI and by the HET.
"It is a campaign that we believed in pursuing and we are committed to and we will maintain the need for a further police investigation."
The relatives, who are also being supported by Democratic Unionist Jeffrey Donaldson, held separate meetings with the Secretary of State and with Assistant Chief Constable Harris.