The Fingal community is "absolutely horrified" about a number of allegedly deliberately lit fires in the area, Break O'Day mayor Mick Tucker says.
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Cr Tucker said he will do everything in his power to try and help bring those responsible to justice.
"They've put other people at risk," he said. "I implore all the people within our big family, if you know something or know someone who does, to get in touch with police."
The main fire has burned more than 6600 hectares, spanning 42 kilometres.
Regional Fire Controller Ian Bounds said westerly winds are an influencing factor in increasing the fire behaviour.
"For the last two days fire conditions have escalated in the afternoon and early evening bringing parts of the Fingal complex back up to an emergency warning level."
Ash has been reported as falling as far away as Falmouth, and the Tasmania Fire Service said people need to be aware of smoke and ash falling out towards the East Coast.
A smoke alert is in place for the Fingal Valley through to St Marys.