A journalist from the
Philadelphia Inquirer interviewed Cappagh locals at the joint funeral of the four victims, reporting a belief among many that the killings could only have been carried out with the cooperation of the security forces. Claims of this nature were notably popularised by an October 1991 episode of the
Channel 4 programme
Dispatches that drew on the evidence of Jim Sands, a former Portadown resident. Nevertheless, he boasted to an interviewer from
The Guardian years later that members of the security forces had suggested they were pleased with the deaths: I genuinely believe that we were very successful, and that may sound morbid but they know that we hammered them into the ground and we didn't lose one volunteer. Indeed, members of the security forces had said that we done what they couldn't do, we put the East Tyrone brigade of the IRA on the run. This gave 'additional oxygen to the oft-repeated charges of collusion' between security forces and militant loyalists. As a result, the competing theory that the deaths of Quinn, Nugent and O'Donnell were not pre-planned but an opportunistic 'bonus' became increasingly common. At the time, police refused to confirm whether individuals questioned in the aftermath included members of the security forces. A 2020 report by the
Historical Enquiries Team revealed that three serving UDR soldiers had been arrested in December 1991 and questioned for several days, but eventually released without charge.{{cite news|title=Report reveals three UDR soldiers were questioned over Cappagh killings ==Later events==