"We still have a number of enquiries to make and a number of people to speak to," said Detective Senior Sergeant Greg Standen.
"Until those enquiries are complete and we have a fuller picture we will not be making any detailed comment.
"We encourage everyone's focus to remain on helping us to identify the vehicle and its driver.
Any information, no matter how small or irrelevant it may seem, may be valuable to the investigation.
If anyone suspects someone or being involved, or knows of a vehicle they believe may have been involved, we want that information so that we can include or eliminate them from our enquiries."
No debris from a vehicle was found at the scene so the vehicle involved may not necessarily have any significant or noticeable damage, he said.
"It is therefore important that anyone who has a suspicion about a vehicle, even if it has no obvious damage, reports it to police."
Anyone with information is asked to contact Whakatane Police on 07 308 5255.
Information can be provided anonymously to the organisation Crimestoppers on 0800 555111.