Media playback is unsupported on your device Media caption Australian Immigration Minister Scott Morrison: "This is a tragedy"

One asylum seeker has been killed and 77 injured during a second night of violence at Australia's immigration detention centre in Papua New Guinea.

The man died of head injuries on the way to hospital, Australian Immigration Minister Scott Morrison said.

Thirteen people suffered serious injuries, including two who are being transferred to Australia for treatment, one with a gunshot wound.

He said the injuries occurred outside the camp, after the men broke out.

Australia sends asylum seekers arriving by boat for detention and processing in offshore camps in Papua New Guinea and the Pacific territory of Nauru.

Conditions in these camps have been strongly criticised by UN agencies and rights groups.

'Great risk'

The violence took place late on Monday night.

"This was a very dangerous situation where people decided to protest in a very violent way and to take themselves outside the centre and place themselves at great risk," Mr Morrison said.

Security outside the centre in Manus Island was the domain of the PNG police, he said.

Australia and asylum Asylum-seekers - mainly from Afghanistan, Sri Lanka, Iraq and Iran - travel to Australia's Christmas Island on rickety boats from Indonesia

The number of boats rose sharply in 2012 and the beginning of 2013, and dozens of people have died making the journey

The Labor government reintroduced offshore processing in Nauru and Papua New Guinea - conditions in its detention camps there have been condemned by UN agencies and rights groups

It also reached a deal with PNG that any asylum seekers found to be refugees would be resettled in PNG, not Australia

The Tony Abbott-led Liberal-National coalition government, elected in September 2013, introduced "Operation Sovereign Borders", putting the military in control of asylum operations

In January reports emerged of Australian navy vessels turning asylum boats back to Indonesia - the UN refugee agency says such tow-backs may breach international law

In January, Australia apologised for multiple violations of Indonesia's territorial waters by navy vessels on asylum operations

Relatively small numbers of asylum seekers are involved: UNHCR's Asylum Trends 2012 report said Australia received only 3% of global asylum applications in 2012

"Those who are maintaining the safety of environment outside the centre need to use their powers and various accoutrements that they have available to them to restore order in the way that is provided for under PNG law," he said.

Ian Rintoul of the Refugee Action Coalition, however, said detainees at Manus Island had told him that locals and PNG police entered the camp and attacked them, after a day of tensions.

"All the people that we have talked to, whether they are workers on the island or whether it's the detainees themselves, say they were attacked," he told the BBC.

Mr Morrison, the immigration minister, said he had been told that "PNG police did not enter the centre and that their activities related only to dealing with transferees who breached the external perimeter".

He urged people to treat "unsubstantiated reports that are put in the public domain" with caution, but said he could not confirm how the various injuries were incurred.

He called the death of the asylum seeker "a great tragedy".

"We don't know what occurred outside the centre and that obviously will be the subject of an investigation into that person's death," he said.

But he said the violence took place in PNG and that any inquiry would take place under PNG law conducted by local authorities.

The violence comes after some of the detainees briefly escaped from the detention centre on Sunday.

'Must be closed'

In recent months Australia has taken a very tough stance in a bid to halt the flow of asylum seekers, who arrive by boat via Indonesia.

Image copyright Getty Images Image caption There are around 1,300 asylum seekers housed on Manus Island

Manus Island is one of two offshore processing camps in which asylum seekers are detained.

Australia has also initiated a policy - aimed as a deterrent - whereby those people found to be genuine refugees will be settled in Papua New Guinea rather than Australia.

Sunday's break-out is reported to have taken place after detainees were told that they would not be resettled in Australia.

Rights groups argue that prolonged detention in cramped, over-heated conditions, compounded by a lack of clarity over when asylum claims will be assessed and where the applicant might end up, can lead to mental health issues in detainees.

They have also questioned whether Australia is adequately protecting vulnerable people.

Greens Party spokeswoman Sarah Hanson-Young said the violence showed the centre "must be closed".

"The reports that one person has died, that shots have been fired, that scores of individuals have been injured, shows that it is untenable to keep the Manus Island detention camp open," she said.

Human Rights Commission President Gillian Triggs said in quotes carried by the Sydney Morning Herald: ''Clearly there needs to be an inquiry into this.''

''The primary obligation that Australia has is to offer protection for asylum seekers and we cannot abdicate that responsibility by sending people to a third country, in this case Papua New Guinea, but it is clear that responsibility is not being met.''

Mr Morrison said that the government was determined to stick to its policies.