The family of a woman murdered and secretly buried by the IRA more than 40 years ago are to sue the police and Ministry of Defence.
Relatives of Jean McConville claim there was a negligent failure to hold a "prompt and efficient" investigation into her abduction.
Confirmation of the civil action came on the 10th anniversary of her remains finally being discovered at a beach in Co Louth.
The mother-of-10, one of the so-called Disappeared, was taken from her west Belfast home in December 1972 on suspicion of being a British informant. Legal proceedings have been initiated against both the Chief Constable of the PSNI and the MoD over events surrounding her abduction, death and subsequent inquiries.
Solicitor Ciaran Mulholland said he has been instructed by members of the McConville family to pursue a claim over the "horrific events".
He claimed Mrs McConville was found by a British Army patrol in the early hours of December 1, 1972 "roaming the streets in a state" after first being interrogated by the IRA.
She was taken to an RUC station at Queen Street in the city but seized again later that day, according to Mr Mulholland.
He alleged that police were told of her abduction within hours but refused to assist.
"The family still do not know the circumstances of this horrendous event: why was their mother taken? Why would the RUC not intervene or investigate the matter?" Mr Mulholland said.
"The McConville family firmly believe that the RUC and subsequently the PSNI have utterly failed to assist the family's quest for the truth."