A teenage boy has been critically injured in a car crash in South Auckland.

The crash - which happened about midnight on Saturday - came after police arrived at a "congregation" of "car enthusiast boy-racers" in Clevedon.

Police "identified a vehicle that had sustained loss of traction", a spokeswoman said.

That vehicle then left the area, she said.

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"A short time after, police followed in the direction the vehicle [left in]. However, no pursuit was initiated.

"The vehicle was found crashed at the intersection of Monument Rd and Tourist Rd in Clevedon at around midnight," she said.

A Westpac Rescue Helicopter was sent to the scene, with the driver - in his teens - in a critical condition, a Westpac spokesperson said.

He was airlifted to Middlemore Hospital.

Two others had minor injuries.