The Taoiseach Brian Cowen is coming under pressure to help establish a cross-border inquiry into the Omagh bombing by relatives of the victims.
Twenty-nine people - and unborn twins - were killed in the 1998 Real IRA attack.
Today is the 12th anniversary of the bombing and a memorial service will be held in the County Tyrone town.
Michael Gallagher, the spokesman for the victims whose son Aidan was killed in the explosion, wants Mr Cowen to step in.