A Papua New Guinean security guard who worked at the Australian run asylum seeker detention camp on Manus Island was allegedly murdered on Friday night.
There has also been the alleged rape of a camp worker and another local guard had his hand severed.
The violence has prompted the Australian Greens to say Manus is in meltdown.
The Manus Province police commander, Alex N'Drasal, says the dead man, who had been drinking home brew, was attacked by locals in a settlement near the camp.
He says another man, who had also been drinking, had his hand cut off in the town on Saturday.
That man is currently in intensive care at Lorengau Hospital.
Superintendent N'Drasal says two arrests have been made in connection with the killing but police expect to make three more.
He says two weeks ago a local woman working at the asylum centre was raped, and the suspects, 3 expatriate guards, were flown out of PNG before police could arrrest them.
Mr N'Drasal says he has asked Australian authorities to return them to Manus and his deadline is tomorrow.
The Australian Greens Senator, Sarah Hanson-Young, says the Australian Government needs to explain what it is doing to make sure staff and refugees are safe.