Police have launched a homicide investigation following the death of a 14-year-old girl in Whanganui.

At around 8:20pm police responded to a call from a person stating that they had harmed a family member, Detective Inspector Paul Baskett said.

Police attended a property on Niblett Street and located the body of the victim.

A 59-year-old woman is currently in police custody.

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Police are not looking for anyone else in response to this incident.

This matter is now before the courts.