A woman was seriously injured after her car collided with a bus at Kingseat, south of Auckland this morning.

The crash happened just after 6am on Kingseat Rd between McKenzie and Batty roads.

The Ritchies bus operating for Auckland Transport was carrying passengers to Papakura at the time.

There were nine passengers on board.

Auckland Transport spokesman Mark Hannan said no passengers on the bus were seriously hurt.

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The driver was also unscathed and had been sent home.

It is understood a woman driving in the opposite direction to the bus collided with it, forcing it off the road into a ditch.

The police Serious Crash Unit is investigating.

Kingseat Rd was shut down for a period but the road has now reopened.

St John Ambulance spokeswoman Noreen Hegarty said the driver of the car was taken to Middlemore Hospital in a serious condition.

She said 12 other people were checked out by paramedics.

None were transported or had serious injuries.