The MP for Manus Island has accused the Federal Government of a cover-up after the Immigration Department released a largely censored report into the alleged rape of a detention centre employee.

Key points: Call for three accused men to be brought back to Manus Island to face investigation

Call for three accused men to be brought back to Manus Island to face investigation Manus Island MP, Ronny Knight, says he has not been made aware of an reports into the matter

Manus Island MP, Ronny Knight, says he has not been made aware of an reports into the matter Immigration department says PNG police responsible for the case

The 68-page document obtained by Lateline under freedom of information refers to the alleged rape of the Papua New Guinean woman by three Australian security guards in July last year.

It is alleged the woman had been drinking with the Wilson security guards, when she was allegedly drugged and later found naked and unconscious in a bathroom at the security staff quarters.

A short time after, the men were stood down and returned to Australia.

In December last year, Lateline lodged a freedom of information request into the case.

Six months later, the Department released the document, however almost every page has been redacted.

The Department argued making the information public would damage Australia's relationship with Papua New Guinea.

Ronny Knight, the MP for Manus and the Vice Minister for Trade, Commerce and Industry, told Lateline the Government was hiding something.

"Obviously there's something there that they're not comfortable for us to see and it's something they've got to hide," he said.

The 68-page freedom of information document released by the Immigration Department. ( ABC: Brigid Andersen )

Mr Knight said the three men accused of the assault should be brought back to PNG to help with the investigation.

"I think they should bring them in and let them clear the air and if they are found culpable for it then let them take the heat for it. That should straighten up the relationship," he said.

Some of the details that can be gleaned from the FOI documents include emails recording the incident on July 15 and 16, 2015, and an email that appears to be from Transfield.

Statements were taken from four people and there appears to have been four alcohol breath tests recorded.

The documents state there was CCTV footage but the synopsis of that footage has been redacted.

A separate source close to the Papua New Guinean Government told Lateline PNG's cabinet has been given a confidential report into the matter.

However, Mr Knight said he had no idea that report existed.

"It means that both the Australian Government and the PNG Government have total disrespect for the leaders of Manus province and Manus district and our citizens take a second place in the grand scheme of things," he said.

In a statement, the Department of Immigration told Lateline that "allegations of criminal activity on Manus Island are a matter for the Royal Papua New Guinea Constabulary."

"The Department of Immigration and Border Protection is aware of the investigation."

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