Police are investigating a house fire in Te Anau and a car fire in Dunedin, both believed to be suspicious.

A Fire Service spokeswoman said two crews of firefighters from Te Anau Station were called to a house fire in Howden St about 4.30am today.

When the crews arrived the blaze in the single-storey house was "well involved", but no one was in the house, she said.

The last firefighter left the scene about 7am.

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However, a "scene guard" would remain at the property until East Otago-Southland fire risk management officer Cathy Trevathan arrived later today to inspect the house.

And firefighters from Lookout Point Station, Dunedin, were called a car blaze in Lambert St, Abbotsford, at 11.38pm yesterday.

No further details were available.