After a 22-hour stand off, Warren was taken into custody with the help of his family, who had worked with police through the night to keep him calm and to end the siege in a relatively peaceful way.
Police commissioner Mike Bush said on the police blog on Friday: “I have been getting daily updates on the status of our four staff who were injured in the shocking events last week.
“Like all of you, our thoughts remain with our staff and their whanau. I’m pleased to advise that three have been discharged, but one is still receiving treatment in hospital.
“I know the Police family will continue to support them and we wish them a speedy recovery.”
The 27-year-old suspect will appear in court in Rotorua District on 24 March.