Police in Papua New Guinea say they are investigating footage posted online showing officers kicking and stomping on a group of men in Port Moresby, before beating them repeatedly over the head with the ends of their rifles.
The 18-minute video was posted on Facebook on Monday night, and appears to have been filmed across the street from the incident.
It shows three men lying on the road after apparently being apprehended by police. The police officers then kick the men, hit them with the butts of their guns and stomp on them.
One officer pulls the shirt off one of the men while punching him. The men on the ground do not appear to resist.
In a statement, PNG's Acting Police Commissioner, David Manning, said the incident appeared to be "a clear case of excessive force", and vowed to bring those responsible to justice.
"Whatever their alleged crimes, police had no right to assault the three persons like that," he said.
"I am shocked at the manner in which the policemen continued to assault the men as they lay defenceless on the ground.
"This behaviour is not expected of members of the Royal Papua New Guinea Constabulary."
Two of the men are shown sitting up towards the end of the 20-minute clip, however their current condition is not known.
PNG Police Minister Bryan Kramer has told the ABC the officers involved have been identified and suspended.
The commander of Port Moresby's police force Anthony Wagambie Jr meanwhile told local media he was appealing to the person who shot the footage to come forward and make a statement to police.
He also called on the victims to come forward and provide statements and their medical records, to help internal investigators charge the officers involved.
Police brutality is a longstanding issue in Papua New Guinea, and authorities have previously come under fire for failing to properly investigate incidents when they occur.
Similar footage showing police assaulting a young man, who was pleading with the officers to stop, went viral last year and sparked an official investigation.
