A man is assisting police with inquiries after an overnight house fire in the western Sydney suburb of Guildford.
Officers were called to the Clement Street home about 3.35am on Tuesday morning, where they found the premises well alight.
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A man and two children were located outside the property, and a 30-year-old woman was located inside the home deceased.
A crime scene has been established at the property, while police and Fire & Rescue NSW conduct further investigations.