Immigration Minister Peter Dutton has confirmed a police operation at the Manus Island detention centre on Papua New Guinea. PNG authorities - reportedly "guided" by an Australian Federal Police officer - at the Delta compound have been searching rooms and shouting at the men to leave.

A Papua New Guinean worker at the Manus Island detention centre was allegedly murdered over the weekend. The victim was allegedly beaten and drowned and his body discovered about 11pm on Friday night, Manus Island MP Ron Knight told AAP. He said PNG police are also investigating separate claims that three Australian expat workers at the centre were involved in the gang rape of a local woman.

Three Australian guards on Manus Island found naked with a woman who claims she was drugged and raped were sent home before local authorities could investigate, the ABC reports.

PNG police said the men and the local woman were found in a state of undress, drunk and sniffing an unidentified substance in mid-July.

But Australia's Department of Immigration and Border Protection has angered PNG police by allowing the detention centre guards to return to Australia before an investigation could be carried out.

PNG's highest ranking policeman Gari Baki said the incident was indicative of the lack of oversight local authorities had over the detention centre

Up to 40 detainees are allegedly removed from Wickham Point Detention Centre, in the largest single transportation this year from Darwin to a remote prison island concentration camp.

The detainees included families and children, some who are believed to be Iranian, according to Darwin Asylum Seeker Support and Advocacy Network (DASSAN) spokesman Peter Robson.

Mr Robson said he was told by detainees inside the centre that dogs and heavily armed guards were used during the transfer.

"This kind of force is not appropriate for any vulnerable person, let alone small children," he said.

"The trauma being caused by this type of action is immeasurable."

Advocates said they saw police cars going in and out of the centre about 1.30am.

The alleged removal follows a claim in April that up to 20 detainees were taken from Wickham Point detention centre following mass protests and self-harm attempts among detainees.

In late June the ABC reported 40 asylum seekers including three babies had been transferred from the detention centre to Nauru.

THE single biggest client of CLP-linked “slush fund” Foundation 51 is a member of the Pasapils family, who are in turn linked to the wickham pt immigration detention centre.

Local media make gentle links to recent commercial planning approvals in Palmerston, but its hard to ignore the fact that our government is in the pocket of the same millionaires who somehow hold a lease on crown land that is now being rented to the Commonwealth as part of a $200 million detention centre deal.