Police are seeking information after the death of a baby in South Auckland earlier this month.
The 10-month-old boy from Manurewa died at Starship Hospital from non-accidental head injuries on 6 September.
Detective Senior Sergeant Kevin Tiernan of Counties Manukau CIB said the team working on the homicide investigation had been speaking with a number of people in the boy's whānau.
"I would like to acknowledge those members who have been co-operating with police so far.
"There are a small group of whānau who are choosing to not cooperate with us as we investigate the death of this 10-month-old boy."
Tiernan said this was disappointing and the police urged anyone who is approached to consider speaking with them.
Anyone who would like to speak with police can contact the investigation team on 09 261 1321, police on 105 or Crimestoppers anonymously on 0800 555 111.