The Brittany Higgins saga has taken yet another twist, with Australian Federal Police the subject of an investigation to determine if officers attempted to pervert the course of justice.

A separate inquiry is investigating how the rape allegations were handled by prosecutors, police and a support service for victims.

The Australian Commission for Law Enforcement Integrity has opened an investigation into whether AFP members pressured Brittany Higgins not to proceed with a complaint.

Hunt for leaks

The Commission will also investigate how confidential information, including the private diaries and text messages of Ms Higgins, were leaked to the media despite not being tendered as evidence in court.

Ms Higgins alleged she was raped by fellow Liberal Party staffer Bruce Lehrmann inside Parliament House in 2019 while both working for former Liberal minister Linda Reynolds.

Mr Lehrmann was charged in 2021 and went to trial last year. It was abandoned because of juror misconduct and there are no findings against him.

He has always maintained his innocence and is suing multiple media outlets for defamation.

The anti-corruption investigation was first reported by Nine Entertainment and News Corp Australia, and the watchdog has been contacted for comment.

-with AAP