One person has died following a crash on State Highway 1 near Grovetown in Marlborough this morning.

A police spokesperson said the crash, involving a van and a truck, was reported at 6.40am.

Three other people have been transported to hospital with serious injuries, they said.

The road is expected to remain closed for the next few hours as the Serious Crash Unit examines the scene.

Diversions are in place and motorists are asked to follow signage in the area.