Whanganui firefighters spent more than two hours at a fire that destroyed the contents of a garage on Sunday night.

They were called to it just before 10.30, and didn't leave the Gorran Ave property until about 1am, Station Officer Bob Wills-Rawlings said.

The metal building at the rear of a section contained household belongings, which were on fire.

The fire was extinguished, and no other property was at risk.

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Firefighters were still trying to determine the cause of the blaze. Whanganui Police were not involved.