A person has been freed from their vehicle after a high-impact crash that caused a car engine to be ripped out of the bonnet.
Emergency services were called to the two-car crash at the intersection of Harmans Gorge Rodd and Woodstock Road at about 10am.
The crash happened between Oxford and Sheffield on the north side of the Waimakariri River.
A Fire and Emergency NZ spokesperson said a person was trapped but freed at about 10.50am.
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An NZME reporter at the scene said the crash involved two cars.
The engine of one of the vehicles was ripped out by the impact.
A St John spokesperson said one person was airlifted to Christchurch Hospital in a moderate condition.
The Canterbury Westpac Rescue Helicopter, two fire appliances and five police vehicles are at the scene.