Relatives of two of the Claudy bomb victims are to take legal action against the Catholic Church, the police and the Northern Ireland Office.
It comes after the PSNI told relatives on Friday that their inquiries would not resume unless new information or evidence emerged.
Legal firm KRW Law said their clients were concerned about “the historical failure to prosecute anyone (and) the lack of accountability on the part of the various parties identified in the ombudsman’s report”.
They said the families of William Temple and David Millar “felt they have no choice but to seek alternative legal redress to compensate them at least in part for those failings”.
“The primary reason in bringing the case is to seek discovery of the material - including intelligence - which was not necessarily made available to the ombudsman when he did his report,” the firm said in a statement.
“We also want to force some measure of acceptance on the part of the state in the flawed decision making that undermined the subsequent police investigations.”