An incident near Karāpiro has blocked a major highway as police search for a person of interest.

State Highway 1 / Tīrau Road, near Karāpiro Road in Waipā, is blocked while emergency services respond to the situation.

Police were called to the area around 10.20am on Friday.

Traffic disruptions are expected across the local network. Police officers have put cordons in place on surrounding roads while they work to find the person of interest.

Motorists are being advised to take alternative routes or expect delays in the area.