A seven-vehicle pile-up has caused traffic chaos north of Sydney with one driver reportedly trapped in the wreckage.
The M1 Pacific Motorway is closed northbound following the multi-vehicle crash at Mooney Mooney Creek Bridge shortly after 4pm on Wednesday.
Aerial footage from the scene shows traffic stretching back several kilometres along the motorway.
Traffic is being diverted off at Calga on the Pacific Highway to ease congestion.
According to NSW Ambulance, there are reports a man is trapped in one of the vehicles.
NSW Ambulance said seven people were treated at the scene with four people transported to hospital.
Three people are currently being to Gosford Hospital with injuries ranging from head injury to minor injuries.
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The head injury is not thought to be life-threatening.
NSW Police said emergency services were called to the scene shortly after 4pm and inquiries were ongoing.
Fire and Rescue NSW attended to one vehicle with a ruptured LPG tank.
Police also responded to a two-vehicle crash on the same stretch of highway.
There is also extensive congestion on the Eastern Distributor after a bus broke down in the Southbound lane at Moore Park on Wednesday afternoon.
Slow moving traffic stretches back to North Sydney however the road has now fully reopened.