A person has been flown to hospital after suffering a medical emergency in Arrowtown this morning.
A Hato Hone St John spokesperson said St John were alerted to the incident at 11am on Saturday morning.
Two ambulance and one helicopter responded.
One patient in a critical condition was treated at the scene, and airlifted to Christchurch Hospital.
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The Allpress Espresso Trail Marathon, that begins at Motatapu Station and ends at Wilcox Green in Arrowtown, is taking place today.