A lane on Auckland's Southwestern Motorway is blocked and a person has been seriously hurt after a two-vehicle crash.

The incident is blocking the right-hand lane westbound between the Onehunga Harbour Rd offramp and the Rimu Rd onramp, a police spokeswoman said.

Police were called to the scene about 6.45pm.

One car was reportedly leaking oil and one person had been seriously injured, the police spokeswoman said.

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A Fire and Emergency spokesman said one person had been trapped in the crash.