A man has been arrested following a violent altercation near Oamaru which left one person seriously injured.

A police spokesperson said a man was arrested following on State Highway 1, Alma-Maheno Rd, at Alma.

Police were called to a property between Fortification Rd and Oamaru-Alma Rd about 1.10pm.

One person was located in a serious condition and transported to hospital.

Police swept into action and located another man shortly after, and took them into custody.

The spokesperson said those involved are known to each other, and charges are being considered.