A 17-year-old boy, who was volunteering as a firefighter in Sydney's west, was arrested on October 2 by the NSW Police Arson Squad.

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It comes after a pattern of allegedly deliberately lit bushfires puzzled police until the investigation turned toward the teenage volunteer firefighter who extinguished them.

Police allege that a series of bushfires in the greater Wallacia area between June 23 and September 7 were sparked intentionally by the teenager.

The 17-year-old from Warrimoo responded to each bushfire in his role

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