A woman is in a critical condition after she was thrown from a vehicle that collided with a tree south of Auckland this morning.

Emergency services were called to the crash on Linwood Rd in Kingseat about 1am.

A northern fire communications spokesman said the woman was thrown into a nearby paddock. It is not known whether or not she was wearing a seat belt.

A Westpac Rescue Helicopter was initially called to the scene. However, the woman was taken to Middlemore Hospital via ambulance.

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Emergency services closed the road and put diversions in place while attending the crash scene.