A person is dead after a crash south of Whangarei.

Four vehicles were involved in the crash which happened on State Highway 1 north of Ruakaka about 4.40pm.

A Fire Service spokesman said one person had died, and they were working to free one person who was trapped.​

In a statement police said three other people are seriously injured. Two people have been taken to Whangarei Hospital.

The crash involved three cars and a light truck.

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The road has since reopened, and the serious crash unit is investigating.