A 15-year-old boy has been charged over the violent robbery of a Christchurch Caltex that left its shop attendant hospitalised.

Police say six males entered a Riccarton Caltex around 1am this morning and threatened the shop attendant.

The attendant received a head injury during the robbery and was taken to hospital.

Cigarettes and a till were stolen and the offenders left in a vehicle, which was followed by a security guard.

The vehicle was last seen in the Burnside area of Christchurch.

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A 15-year-old male was later arrested and charged with aggravated robbery and appeared in youth court today.

He was remanded in custody.

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