Three Papua New Guinea immigration officials have been arrested over the assault of a refugee on Manus Island who says he was threatened with death and refused medical treatment.

Iranian refugee Mohsen Sakhravi, 28, alleges he was repeatedly beaten and forced to run in front of a PNG immigration vehicle back to his Australian-funded accommodation.

The assault happened after Mr Sakhravi missed a 6:00pm curfew imposed on refugees living at the East Lorengau transit centre on Manus Island while they wait for permanent resettlement elsewhere in PNG.

At the time of the attack, provincial police commander Alex N'drasal incorrectly identified the suspects as security guards.

However, the suspects worked for PNG immigration and have been identified as Randall Livingstone, Kopi Kaminiel and Septer Wailiou.

They are aged between 28 and 30 years and are not from Manus Island.

They have been released on a bail of $46 and are expected to face a Manus Island district court next week on assault charges.

'We gonna kill you'

The ABC has obtained a copy of the refugee's handwritten statement to police, which details the attack and alleged death threats.

Mr Sakhravi was at the Harbourside Hotel with a friend at around 9:30pm on June 1 when hotel staff told him immigration officials were waiting at the gate.

"I say hello and they started punching me on the face and I say why and they told me look at the time," wrote Mr Sakhravi.

"Again they punch me and told me this is my country, and we gonna kill you."

Several sources on Manus Island have independently confirmed the assault outside the hotel.

Mr Sakhravi said he was forced to run in front of a vehicle carrying the PNG immigration officials back to the East Lorengau transit centre.

"When I stop running they came down and beat me again," he told police.

Photographs taken after the incident show Mr Sakhravi with a bruised face.

"After a few hours I asked them to go to the hospital and they refused and told me it's not an emergency," said Mr Sakhravi.

Comment has been sought from PNG's chief migration officer Mataio Rabura.