Two ambulances, one operations manager and one rapid response vehicle responded.
Five patients have been assessed at the scene.
“One patient has been transported to Tauranga Hospital in a serious condition,” St John said.
“Three more patients have been transported to hospital, two in moderate condition and one with minor injuries.”
Fire and Emergency NZ said one crew was called to the crash between a car and a truck about 1.20pm.
“All people were out of the vehicle, and staff were helping with scene protection.”
NZ Transport Agency Waka Kotahi reported that the road was blocked.
In a highway update, the roading agency said caution was advised.