New video has emerged showing part of the aftermath of last week's deadly violence at the Manus Island detention centre.

The footage obtained by the Guardian Australia website shows a makeshift hospital where the injured are treated on stretchers by frantic staff.

At one point, someone can be heard calling out: "gunshot wound, gunshot wound".

Later, someone yells "triage!"

According to a Guardian report, the footage was filmed on a concrete wharf next to the floating accommodation block used by Australian detention centre staff.

It shows medical staff treating asylum seekers by torchlight, although it is difficult to see how serious the injuries are.

A 23-year-old Iranian man, Reza Barati, was killed and dozens of others injured - some seriously - during the unrest at the centre on February 18.

An autopsy has been carried out on Berati's body but Immigration Minister Scott Morrison says the results are a matter for Papua New Guinea authorities.

Mr Morrison visited Port Moresby to meet Papua New Guinea's foreign minister, justice minister and Attorney General.

The talks focused on the management of the detention centre on Manus Island and arrangements for resettling refugees.

Just before the violence began almost two weeks ago asylum seekers were reportedly told PNG was the only option for resettlement.

But PNG's foreign minister told parliament his government had not yet decided whether to resettle refugees within Papua New Guinea.

Meanwhile, Berati's family has told the ABC it believes he was murdered and it is holding the Australian Government responsible.

In a statement, Mr Morrison has described the death as "tragic" and he appreciates that Berati's family is feeling a very deep sense of loss.

"The Australian Government has made arrangements with the government of PNG to return Mr Berati's remains to his family in Iran," he said.

There are a number of investigations underway to determine what took place at Manus Island, including one into the involvement of Papua New Guinea police.

A preliminary report found that Berati died of multiple head injuries, most likely caused by a heavy object.

Earlier this week, PNG's deputy police commissioner Simon Kauba told the ABC that officers and locals were not responsible for Berati's death.