The death of a prisoner at Hawke’s Bay Regional Prison on Sunday is being treated as unexplained by police.

Police were made aware around 12.45pm on Sunday of a man who had died at the prison “following an incident”.

In a statement, Detective Inspector Martin James said an investigation into the death was under way.

Acting general manager at the prison Shannin Mortensen said prison staff made every effort to save the man, but were unable to revive him.

Mortensen said the man was found in his cell and he was not double-bunked.

The matter has been referred to police, who have contacted the man’s next of kin.

“Our thoughts are with those impacted,” he said.

“Other men in the unit and staff are being provided with support, including access to chaplains and cultural support where requested.”

All deaths in prison are subject to an internal incident review, investigation by the independent Corrections Inspectorate, and are also referred to the coroner, Mortensen said.

“The Inspectorate and coroner both complete a robust independent assessment of each incident providing commentary and recommendations regarding the care and treatment of deceased individuals,” he said.

“In addition, the coroner confirms the cause of death.”