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