Police are investigating a suspicious house fire in rural Manawatu.

A police spokeswoman confirmed no one was hurt in the fire, but said police were looking for a possible suspect.

Central Fire Communications' shift manager Mike Wanoa said emergency services were called to the fire on Rangiwahia Rd, 50km northeast of Feilding, about 8.30pm.

A single-storey house was "fully involved", but everyone inside had got out.

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Up to 20 firefighters from Kimbolton, Rangiwahia, Cheltenham and Apiti volunteer brigades were still at the scene late tonight.

Manawatu rural firefighters had also come to help, Wanoa said.