A person seriously injured in an incident with a quad bike has been taken to hospital by helicopter.

Fire and Emergency NZ attended the incident around 6.30pm on Hooper Rd, Aranga, in the Kaipara District where it is understood a quad bike rolled, trapping the rider.

St John Ambulance also attended and confirmed it took one person with serious injuries to Whangārei Hospital by helicopter.

Emergency services had earlier been at the scene of a two-car motor vehicle crash in Kaipara Flats, Auckland.

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Two people were injured in what was understood to have been a high-speed head-on crash just after 6 pm.

The crew from the Auckland Westpac Rescue Helicopter treated a male patient in his 20s involved in the crash for severe abdominal injuries. He was given two units of blood at the scene.

The man was flown to Auckland City Hospital in a critical condition and another was taken to North Shore Hospital with minor injuries.