A high-ranking Australian Border Force officer is believed to have quit while facing an investigation into allegations he had an inappropriate relationship with a female staff member.
Assistant Commissioner Peter Docwra - who was head of the ABF's capability division - was on leave before deciding to resign on Thursday, News Corp reports.
Comment is being sought from the immigration department, which so far has been tight-lipped on the senior uniformed officer's absence.
Reports of an inquiry into Mr Docwra's personal conduct first surfaced last week, just days after it emerged ABF commissioner Roman Quaedvlieg was on leave due to a separate external investigation.
The investigation into Mr Quaedvlieg centres on allegations he helped a junior staffer with whom he had a relationship secure work at Sydney airport.
He is understood to have denied the allegations against him.