Papua New Guinea's top policeman, Tom Kulunga, says it is totally unbelievable officers allegedly slashed the achilles tendons of a group of people in Port Moresby last Saturday.
Signs are the group had committed no offence and was returning home after police had earlier stopped the group from confronting people at another camp.
The police media relations officer, Superintendent Dominic Kakas, says the group was then allegedly attacked by another squad of police armed with bush knives.
Mr Kakas says Commissioner Kulunga is adamant there is no place for such brutality in the force and any officers involved face suspension and arrest.
"The commissioner is quite concerned about that, especially just when last month we launched the police modernisation programme, which is all about the constabulary getting back to basics and doing things the way they should be done."