One person has been flown to hospital after suffering serious injuries when their vehicle collided with a milk tanker in Wairarapa this morning.

The crash happened on State Highway Two at west Taratahi, between Masterton and Carterton, about 8.30.

A police spokeswoman said a person travelling in the vehicle was taken to hospital by helicopter in a critical condition. They were believed to be the only occupant of the vehicle.

The driver of the milk tanker wasn't injured.

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The crash has closed that section of SH2 and diversions are in place while investigators are at the scene.