Hamilton office workers have been evacuated, and a central city street has been cordoned off following a fire in an office building.
The fire started on the first floor of the Bridgewater building at 12.30.
Emergency services are at the scene and police have cordoned off Grantham Street.
Northern fire communications shift manager Jaron Phillips says the fire has been extinguished and they're ventilating the building.
He says it appears to have started in a transformer.