Australian officials have not requested details from Israel about an Australian-Israeli man known as "Prisoner X" who died in an Israeli jail as they knew about the case before his death, a report said Saturday.
A senior Israeli official told The Australian newspaper that Canberra would likely not ask for any information because the government already had detailed knowledge of the case.
"Every day that goes by you see how deeply involved they were," the official said, according to the report.
"It is clear they were in the know long before he died."
An Israeli probe into the death in December 2010 of the prisoner identified in Australian media as Ben Zygier, a 34-year-old Australian Jew recruited by Israel's Mossad spy agency, found it was a case of suicide.
But a justice ministry official who spoke to Israeli journalists said the judge handling the mysterious case has demanded a further probe "to examine issues of negligence".
The fact that the detainee, held in a high security prison under continuous surveillance, managed to hang himself has raised questions and fed conspiracy theories which have been reported by the Israeli and Australian media.
Citing a source close to the case, the Israeli newspaper Haaretz reported on Friday that Israel had signed an agreement with Zygier's family offering a large sum of money as compensation.