Two 13-year-old boys are assisting Sydney Police with inquiries into a former factory fire that's being described as a once-in-a-decade inferno.

The Surrey Hills blaze tore through the seven-storey heritage-listed building late yesterday.

Australia Correspondent, Emma Cropper told Heather du Plessis-Allan that the boys handed themselves in at separate stations.

She said that while Police are still searching for around three to four other school kids, and are currently obtaining statements from the two in custody, though how much information they are receiving is unknown. 

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