The inquiry into the retention of children's organs at Irish hospitals has lost the support of the victims' families.
Parents for Justice voted at a weekend conference to seek the return of documents they submitted to the Dunne inquiry investigating the circumstances surrounding the retention of dead children's organs without parental consent.
The group says the inquiry, chaired by senior counsel Ms Elizabeth Dunne, is not getting full co-operation from the hospitals. They have also called for the inquiry to be set up on a statutory basis.
Parents for Justice has been growing increasingly frustrated with several aspects of the inquiry and last week reacted angrily to reports the inquiry was being scaled back.