A busy Tauranga highway has been shut down after a serious crash this afternoon.

The stretch of State Highway 29a between Oropi Rd and Poike Rd has been closed as emergency services attend a crash near Poike Rd.

A police communications spokeswoman said the Serious Crash Unit was advised.

She said the crash came in at 4.07pm but it was not yet known when the highway would be reopened.

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The spokeswoman said one person had suffered serious injuries and another sustained moderate injuries.

Firefighters and St John ambulance staff were also called to the collision.

It is understood firefighters have been called to assist in cutting an occupant out of the vehicle.