Police and a fire investigator are on their way to a suspicious fire at Riverhills Primary School in East Auckland this afternoon.

Northern Fire Communications' shift manager Dallas Ramsay said they were alerted to a fire in the roof of the Pakuranga Heights' school's boiler room and caretaker's shed just before 5pm.

The building is 16sq m in size and the incident is being described as a small property fire, Ramsay said.

The fire was considered suspicious and police had been called. A fire investigator is also on the way to the school, which is on Waikaremoana Pl.

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One crew each from Howick and Mt Wellington Fire Brigades are at the scene.