Sergeant Ray Wylie said: "It may be that the drivers we have been told about knew there were other witnesses and therefore felt there was no need for them to stop. However it is vital in these cases to ensure we obtain accounts from as many witnesses as possible so that the investigation is thorough and we can help Eion's family understand how and why he died.
"It is also essential in the interests of justice as we need to determine what, if any, enforcement action should be taken. It is important to stress that these drivers are being sought as witnesses. There is no suggestion that they have committed any offences and therefore they have nothing to fear from coming forward."
Anyone with information about this crash is asked to contact Opotiki police on 07 315 1112 or Whakatane police on 07 308 5255.