A 57-year-old woman arrested in west Belfast in connection with the abduction and murder of Jean McConville in 1972 has been released pending a report to the Public Prosecution Service.
She was earlier questioned in the PSNI's Serious Crime Suite in Co Antrim.
The abduction, murder and secret burial of Mrs McConville in 1972 is one of the most notorious incidents of the Troubles.
Mrs McConville was dragged away from her children in her home in the Divis flats by an IRA gang of up to 12 men and women after being accused of passing information to the British Army.
An investigation later carried out by the Northern Ireland Police Ombudsman rejected the claims that she was an informer.
Mrs McConville, one of the so-called Disappeared, was shot in the back of the head and buried about 80km from her home.
The IRA did not admit to her murder until 1999, when information was passed to gardaí.
It was not until August 2003 that Mrs McConville's remains were found on Shelling Hill beach, Co Louth.