A neighbourhood dispute over loud music and erratic driving has escalated into a bloody brawl in which a chainsaw partially severed a man's arm.

Doctors are attempting to reattach the arm of Mark Jorgensen, 29, after the altercation in in Fenton Close, Minto, last night.

Lost a finger in the incident ... Troy Thornton.

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Another man, Troy Thornton, 26, lost a finger in the dispute. His sister, Nicole Thornton, claimed he was attacked with a samurai sword.