Watkins said police had interviewed the child and he had notified all other Rotorua schools.
"I spoke to the children at assembly, and reminded them of the strategies they should use if approached in this manner."
A police media spokeswoman said police received reports of the suspicious approach at 8.39am.
"Inquiries into the approach are ongoing."
Rotorua police could not be reached for further information.
Any information can be given to Rotorua police on (07) 348 0099 or the anonymous Crimestoppers line on (0800 555 111).
A guide for parents and caregivers
• On their way home from school, children may be approached by people who are seeking directions, wanting help or offering a ride.
• Make sure your child understands that they shouldn't accept rides from anyone unless it has been prearranged with you.
• Children should keep a safe distance from vehicles or people they may meet when walking alone or with friends.
• Encourage them to tell you about anything unusual that happens on the way home.
• If possible, get them to record registration numbers, colour and make/model of any suspicious vehicles. This should be done carefully so that the driver doesn't notice.
- New Zealand Police