Three overnight fires in Dunedin are being treated as suspicious

The blazes broke out in a vacant building, vacant home, and 30 by 30 metres of pine trees overnight - between around 11.30pm and 1.30am.

Fire investigators are due at the scene of the two structure fires, but not the trees.

Earlier, crews extinguished a house fire in Wakari about 4pm, and multiple structures went up in flames on a farm in Western Balclutha about 8pm.