A young farm worker whose leg became trapped in a feed-out machine on a Mid Canterbury farm for more than an hour has been flown to hospital with serious injuries.
Emergency services were called to the rural property at Staveley, 40km northwest of Ashburton, just before midday.
A spokesperson for Fire and Emergency New Zealand said they were on the scene, helping police and St John.
Photographs from the scene show two fire trucks, several St John vehicles, police, and the Westpac Rescue Helicopter at the farm.