A man is in custody and a person was taken to hospital after police, including the armed offenders squad, were called to a property in Somme Pde in central Whanganui.
A police spokeswoman said an incident was reported around 12.25pm on Sunday. Cordons were in place on Somme Pde around Halswell and Argyle streets and the public was advised to avoid the area. The armed offenders squad, armed police and an ambulance were at the scene.
One person was transported to Whanganui Hospital with moderate injuries, police said.
At 3pm police said the incident, which related to a family harm matter, had been resolved.
"One man has been taken into custody and cordons will remain in place while police make inquiries into the circumstances of the incident."