A man has died after a crash in Awanui, Northland.

Two vehicles collided head-on at Kareponia Hill on State Highway 10, Awanui about 5.45pm, Senior Sergeant Brian Swann said.

He said a man had died and a woman was flown from the scene in a serious condition.

Mr Swann said two other people were involved in the crash, their injuries are not yet known, but were not believed to be as serious.

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The road is closed, with diversions in place.

About 10 minutes later, an 11-year-old girl was critically injured when she was caught between the door and the body of a vehicle when it struck a fence post.

The crash occurred on McAlister Rd, Mangapai.

Mr Swann said when police arrived it looked like a vehicle with no driver had rolled and run over a person before coming to rest up against a gate.

The girl taken to Whangarei Hospital by St John Ambulance.

The Police Serious Crash Unit was attending both crashes.