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"It was too long and all the time there were people being killed - there were atrocities, including on the republican side."

Last year an inquest found the atrocity, in Kingsmills, was an overtly sectarian attack mounted by the IRA.

The RSF says it attacked the camp but denies committing any atrocities.

It's been more than 24 hours since the atrocity, and those affected are still struggling to come to terms with what's happened.

"Without accountability, we risk continuing to watch atrocities unfolding, and the norms designed to protect us all, eroding."