Police are at a serious car crash on Dairy Flat Highway where three people have been hurt.

One other person is in a serious condition and two people are moderately injured following the two-car accident.

Emergency services were called about 5.50pm.

The highway is closed in both directions and diversions are in place.

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Southbound traffic is being directed down Pine Valley Road and northbound traffic is being directed up Postman Road.

The Serious Crash Unit is investigating.