Police and fire officers are investigating a blaze at a council flat in Christchurch early today.

Southern Fire Communications shift manager Brent Dunn said firefighters were called to the Spreydon block of four flats about 4.10am.

Fire crews found a fire on the outside wall of a flat and a person suffering from smoke inhalation.

The injured person was treated by ambulance officers at the scene.

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Dunn said the Spreydon fire was being treated as suspicious.

Police and fire investigators would return this morning to determine how the fire at the rental property started.