Police could not have prevented an IRA mortar attack that killed a police constable in Newry, County Down in 1992, a report has concluded.
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But the police ombudsman found there were failures in the investigation into Colleen McMurray's murder.
One of those thought to have been involved was a police informant but they were never treated as a suspect.
Her family accused the Provisional IRA and the British government of being "joint participants" in her murder.
The PSNI said it was "truly sorry" for the shortcomings the ombudsman found in the police investigation.
Mrs McMurray, 34, was a passenger in a police car hit by a mortar bomb as it travelled along Merchants Quay.
Her colleague, Paul Slaine, survived, but lost both his legs.
Mrs McMurray's family said she "served all the communities without fear or favour and knew the risks involved in being an RUC police officer at that time" but they "strongly contend" that her murder could have been prevented.
They are calling on Northern Ireland Secretary Brandon Lewis to establish a judge-led statutory inquiry into the murder as soon as possible.
The ombudsman's office has been looking into the case since 2004.
Its investigators interviewed more than 90 witnesses, included 35 retired police officers.
The report said the original Royal Ulster Constabulary (RUC) investigation was undermined by its own Special Branch division, which did not provide information about potential suspects.