A 29-year-old man was arrested in New South Wales' north after a woman was found dead.

Police were called to a unit on Poinciana Street, Mullumbimby, at around 11.55pm following reports of a domestic dispute.

Upon arrival, police found a deceased woman in her 20s who has yet to be identified.

The 29-year-old was arrested at the scene and was taken to Byron Bay Police Station.

Police have established a crime scene, and investigations are ongoing.

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