More fires have burned overnight at Waikeria prison and Corrections say the situation at the facility remains "incredibly volatile".

Incident Controller Jeanette Burns has confirmed the disorder at Waikeria continues with 16 prisoners remaining non-compliant in the "top jail" facility.

"I appreciate that this event is significantly distressing for the family and friends of the prisoners involved. We have no information to suggest that any of them are hurt. We are continuing to urge the men to surrender to staff. We do not want the men, our staff or other emergency services staff to be harmed."

Anyone who isn't calling for the men to immediately peacefully surrender is putting their safety at risk, alongside the safety of our staff and emergency services, she said.

The prisoners have continued to light fires within the facility overnight, make threats toward staff and police and throw debris at them from the roof of the buildings.

"We are concerned about the structural integrity of the burned buildings and the potential for them to collapse, and the toxicity of burned building materials. Alongside this we know that there are tensions between members of the group, they have access to weapons and they may have taken drugs from the dispensary."

The situation remains "incredibly volatile" and options for intervention are limited due to the dangers present.

"Despite this, we are continuing to work closely with Police to ensure that every opportunity to resolve the incident with the intention of minimising harm to anyone is considered and acted on."

"We have a duty of care to these men, and it is likely that they will remain in our custody for a number of years to come.

"Their point has been made – we are currently building a new facility to replace the existing top jail facility, which will be completed in 2022."

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Prisoner payphones, and all other phones at the prison, are currently not functioning.

Corrections says it appreciates that this will be worrying and inconvenient for both prisoners and their family and friends. They are working to resolve this urgently, but can provide assurance that all prisoners in other units are safe and well in the prison.