Police management are investigating the actions of a group of off duty officers after "concerns" were raised about their behaviour.
The alleged behaviour occurred the same night that one officer allegedly sexually assaulted another.
But police are refusing to give further details.
The Herald revealed last week that a 28-year-old policeman had been charged with indecently assaulting and sexually violating a policewoman on February 5 in Northland.
The officer's name was suppressed - as well as further details about the case.