Four people are injured, two seriously, in a crash north of Auckland this morning.

Police were called to the scene shortly before 8am and the Serious Crash Unit has been contacted, a police spokeswoman said.

Five people were involved in the single car crash in Dome Forest, between Warkworth and Wellsford.

Four people were injured, two seriously.

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One person has minor injuries and another moderate injuries.

North bound traffic was blocked in the area, the spokeswoman said.