A woman is in a serious condition and two children have minor injuries after two cars collided in Christchurch.

Senior sergeant Vaughn Lapslie from the Canterbury district command centre said the crash occurred on the corner of Purchas and Sherborne streets, in St Albans, at 6.30pm today.

Southern ambulance communications spokesman Andy Gray said the woman was briefly trapped in the vehicle.

She was freed and taken to Christchurch Hospital in a serious condition.

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He said two children were in the same vehicle as the woman.

Police were investigating the cause of the crash.