Asylum seekers have written to the government outlining their concerns about living conditions on Manus Island, as reports emerged of a Christmas Eve scuffle at the detention centre.

The asylum seekers' letter says the heat and dust is affecting those in the Papua New Guinea centre badly and one woman with asthma has twice become unconscious, the ABC reports.

"If there's one particular theme that runs through it, it's, 'How long are we going to be on Manus Island? We need an answer to when our processing is going to begin and how long we're going to be on Manus Island'," Ian Rintoul of the Refugee Action Coalition told the broadcaster.

"But it details a range of things: the lack of air conditioners, the fans, the heat that the children suffer."

Mr Rintoul said if the government failed to respond to the letter, mass protests could follow.

Amnesty International's Alex Pagliaro told the ABC it's clear frustrations are growing.

"We all know that when you put human beings into this situation, that is locking them up arbitrarily and indefinitely, they begin to crack," she said.

"An unavoidable outcome of this is tensions rise, people do damage either to themselves or in some cases to the people around them."

Seven people including a staff member received minor injuries in a Christmas Eve scuffle between Tamil and Iranian asylum seekers, Fairfax reports.

It's believed the incident occurred when Iranian detainees tried to recruit Tamils to protest, and the Tamils refused, the report said.

 

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