Published Thursday, 12 January 2012
Inspector Bill Elliott was murdered in Rathcoole, Co Antrim in September 1974 as he responded to reports of a robbery at the Ulster Bank in the area.
The 48-year-old was shot by members of the Official IRA who were armed with two submachine guns and a pistol. He was posthumously awarded the Queen's Police Medal.
The PSNI revealed in October that the case had been reopened after a review of the case by the Historical Enquiries Team found potential new leads.
On Wednesday morning, the men - aged 58 and 61 - were arrested in the Co Antrim area and taken to Antrim Serious Crime Suite.
The 61-year-old has been released unconditionally while the other man has been released pending a report to the Public Prosecution Service.