A seven-year-old boy has died after the car he was travelling in crashed into a gully yesterday afternoon at Williamtown in the state’s Hunter region.

About 4.10pm (Wednesday 21 January 2015), a 35-year-old man was travelling in a Nissan Pathfinder with four children, aged between seven and 14-years-old, in southerly direction along Medowie Road.

As the driver approached banked up traffic near the intersection of Nelson Bay Road it appears he has driven the 4WD along a grass section of road to the left of the waiting traffic.

The driver lost control of the car near a gully and the 4WD became airborne and impacted heavily on the opposite side.

A seven-year-old boy seated in the rear of the car suffered serious internal injuries and was transported to John Hunter Hospital; however he later died.

The other occupants of the car were also taken to hospital for minor injuries.

The driver was subjected to mandatory blood and urine samples.

A crime scene was established and investigators from the Hunter Crash Investigation Unit along with local police attended. Traffic in the area was disrupted for six hours.

A report will be prepared for the information of the Coroner and investigations are continuing.