The crash was blocking the east-bound lane towards Rotorua.
SH5 TAPAPA - SERIOUS CRASH - 2:45PM A serious crash has CLOSED a section of #SH5 between Waimakariri Road and Harwoods Road in Tapapa. Please delay your journey or use an alternative route. Updates here: https://t.co/OreU2yPCDx. ^MF pic.twitter.com/95f3ctOVwM
— Waka Kotahi NZTA Waikato/BoP (@WakaKotahiWaiBP) July 12, 2019
It is understood the road is still closed.
A St John spokeswoman said earlier that they were treating one person with serious injuries, one with moderate injuries and one with minor injuries and a rescue helicopter has been called to the scene.