A pattern of deliberately lit bushfires puzzled police until the investigation turned towards the teenage volunteer firefighter who extinguished them.

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Stock image of a volunteer firefighter extinguishing a blaze. Picture Jim Aldersey

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

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 respon

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