Relatives of victims of the 1998 Omagh bombing are to meet the Northern Ireland secretary later to continue their campaign for a public inquiry.
Twenty-nine people and unborn twins died in the Real IRA atrocity.
The families say they will give Owen Paterson new evidence that authorities on both sides of the border could have prevented the bombing.
No-one has been successfully criminally convicted of the bombing which devastated the County Tyrone town.
Spokesperson for the relatives of the Omagh bomb victims, Michael Gallagher, said if the Secretary of State doesn't call a public inquiry, the the families will go through the courts....