The NZ Transport Agency has closed State Highway 1 at Edendale in Southland just after 2.30 pm today while Police and Fire Service respond to an explosion at the Fonterra Edendale Factory.
If possible drivers of heavy vehicles should detour via State Highways 6 (north of Invercargill) and 96, through Winton.
Southbound truck drivers should turn off at State Highway 96, south of Mataura, and avoid Edendale, says the Transport Agency.
The Transport Agency asks all drivers to slow down on these roads and take care in the area until the highway can be reopened.