The British government is once again being urged to release documentation on the Dublin-Monaghan bombings.
34 people, including a full-term unborn child, lost their lives in the 1974 blasts.
They will be remembered in the capital tonight, when U2 takes to the Three Arena stage with their song Raised by Wolves.
The band has been raising the issue throughout their current tour when performing the song, which appeared on their latest album Songs of Innocence.
Bono and his bandmates have taken up the campaign of the Justice for the Forgotten group - who want the British government to release documents connected with the atrocities.
The families will be present for the song at tonight's performance in Dublin, the first of four concerts at the Three Arena for U2 over the course of the week.
Spokesperson Margaret Urwin says U2's campaign is a strong and direct message to the British authorities:
