A large house fire in the Christchurch suburb of Dallington is being treated as suspicious.
Fire crews were called to a blaze on Avonside Drive, near Gloucester St, just before 3am.
The fire has since been extinguished.
A Fire and Emergency spokesperson said a fire investigator will arrive on the scene this morning.
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They say they're confident nobody was home at the time of the blaze.
Motorists are being diverted from the area.