Several students were at the scene when it happened, he said.
A teacher from the school and members of the public arrived shortly after to help.
Cleland said the school’s guidance counsellor would be available to any students who felt they needed support.
The school was waiting to hear from the injured student’s family about her condition.
Senior Sergeant Hunter told the Bay of Plenty Times that initial reports were the student was struck as she crossed the road in front of a parked bus, which he said appeared to obscure her view.
He said the student was unconscious for a time, but had regained consciousness and was walking and talking when police arrived.
Hunter said the student was taken to Tauranga Hospital by ambulance for a check-up and observation in case she had suffered a concussion.
He said it was important to “never cross the road in front of any parked heavy motor vehicle”.
“Always cross from the rear or wait until the vehicle has driven away, as you never know what’s coming the other way.”
Tauranga City Council said the crash happened outside 244 Ngatai Rd. The road has since reopened.