Four people have been injured - one critically - in a crash between a truck and car in Matamata tonight.

Police say one person is in a critical condition while three others suffered moderate injuries.

It is not yet known whether all those injured are from the one vehicle.

Emergency crews were called to an area on State Highway 27, near Pitt St, just after 6pm.

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A police spokeswoman said a helicopter was going to be sent to the scene and diversions were now in place.

Motorists in the area are asked to delay travel or find alternative routes.

The Serious Crash Unit has been advised.