A man is in a serious condition in hospital after the vehicle he was in crashed into a lake in Hawke's Bay this evening.

The 35-year-old was taken to Gisborne Hospital following the accident on Kaiwaitau Rd, in Mahia.

A central ambulance communications spokeswoman said just before 6pm they paramedics were accessing the patient at the scene.

They were called to the site after reports that a vehicle had crashed into a lake, she said.

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The circumstances are not yet known, but a member of the public was assisting at the scene also.

The Fire Service was also on way to the scene, a spokesman confirmed.

He said they were told the car had started to sink into mudflats in the area.