UPDATED 8.51am: A police officer remains in Waikato Hospital after an early morning assault in Huntly.
A fellow officer has been treated and discharged.
They were attacked by a man wielding a metal pipe.
They'd stopped his car on Paki Street after the driver initially refused to pull over.
Pepper spray and a Taser were being used, when a male passenger then attacked the officers from behind with the pipe.
The passenger fled the scene, but police know who he is.
The 30-year-old driver was arrested and will appear in Hamilton District Court charged with with assault and driving offences.
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