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An 18-year-old man was injured when he was struck by a truck in Kaikoura early this morning.

Police said the teen, thought to be from the Christchurch area, was hit by a northbound truck and trailer unit on State Highway 1 about 4am.

He was treated by a doctor at the scene, before being flown to Christchurch Hospital.

Police were working to to establish the cause of the crash.

- APNZ