Armed police have guarded an Auckland police station following a fire which caused extensive damage to an office area last night.
Sixteen fire trucks were called to a fire in the ground floor annex of the Auckland central police station at around 11.05pm, where a full evacuation was carried out, Auckland city district commander Superintendent Karyn Malthus said in a statement.
The area where the fire was located sustained extensive damage and staff will be relocated, she said.
The fire began in the police prosecutions office, which is secure, 1 NEWS understands. The fire was contained at 12.20am, the spokesperson said.
"The whole police station has been evacuated, and the adjacent accomodation building next door as a precaution," Fire and Emergency NZ area commander Auckland's John Booth told 1 NEWS.
"There was a lot of smoke coming out of the building when Fire and Emergency arrived."
Armed police guarded the police station following the fire.
One fire truck remained at the scene overnight to monitor the scene.
A firefighter was hospitalised with minor leg injuries.
Fire investigators have attended the scene.
A scene examination is currently underway to determine the exact cause of the fire.
The fire is not being treated as suspicious at this stage, Ms Malthus said.