A car has flipped on its roof after a crash outside ASB Showgrounds in Auckland.

A police spokesman said they were called to the crash on Greenlane West at Puriri Drive just before 8pm.

There were multiple reports about the number of vehicles involved and a report of one person possibly being trapped in the car.

The car which flipped is blocking one lane of Green Lane West and Police are asking motorists to avoid the area.

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A St John spokeswoman said one ambulance was at the scene.

One person was in moderate condition and four people were in minor condition.