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Emergency services were called to the crash at the intersection of Wards and Sandy Knolls Rds about 7.30am.
A Fire and Emergency NZ spokesperson said extraction tools were used to free them.
A St John spokesperson said they sent two ambulances, one rapid response vehicle and one manager to the scene.
Two patients were being treated – one in a serious condition and one in a moderate condition and are expected to be transported to Christchurch Hospital.
The car appears to have rolled some distance.
-By Devon Bolger