A woman's body has been found at a home in northern NSW with a man being questioned and an investigation launched into the police response to the incident.
Officers were called to the home at Casino in the Northern Rivers region during the early hours of Saturday morning over welfare concerns.
The woman, who is yet to be formally identified but thought to be in her 40s, died at the scene.
A 31-year-old man believed to have known the woman was arrested and taken to Lismore Police Station, where he was being questioned.
A crime scene has been set up and a regional critical incident team will investigate all circumstances surrounding the case, including the police response.
The investigation will be subject to an independent review, police said.
Homicide squad members are separately working with local officers to probe the woman's death.
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