There remain questions about how authorities in both Ireland and the UK handled the events around the 1998 bombing that killed 29 people.

The initial stage of the Omagh Bombing Inquiry opens on Tuesday. The hearing will commemorate the lives of the 29 people murdered in the County Tyrone bombing, including a woman expecting twins. The attack, carried out in 1998 by the Real IRA, was the biggest single atrocity of the Troubles.

An independent public inquiry into a 1998 bombing in Omagh in Northern Ireland in which 29 people were killed and 220 injured, the worst atrocity of "The Troubles," opened with testimony from victims' families.

Claire Hayes, whose brother Alan Radford was killed in the blast, said the Irish Government should be a full participant.

Fernando Blasco Baselga and Rocio Abad Ramos were in Omagh as part of a language exchange group Tributes have been paid to two Spanish victims of the Omagh bombing during the first phase of a public inquiry into the 1998 atrocity.