11.25am: Police have revealed there was a second body in the cabin of the truck. Investigators have found a woman's body, but her age and name are not known at this stage.
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The second fatality will also be investigated by the coroner, a police spokesman said.
11.10am: Police have revealed they know the victim's name, but are waiting for the coronial investigation to conclude before it is revealed. They were unable to say if the victim was a Mid-North Coast resident, or provide any details.
They were able to say it is believed the fire started in the truck's cabin. It is not known if the fire started prior to the truck leaving the Pacific Highway.
A police spokesman said a large amounts of chemicals had leaked into the surrounding terrain. Information has been sought about possible environmental damage
Emergency services spent the last 90 minutes working around the cabin of the vehicle.
9.20am: Police forensic investigators, Laurieton Fire Brigade and Rural Fire Service officers are at the scene of this morning's fatal truck fire at Heron's Creek.
The clean-up continues as one northbound lane of the Pacific Highway remains closed to traffic.
The Roads and Maritime Service is directing traffic and motorists are urged to drive with care.
HAZMAT crews and the fire brigade are monitoring the scene around the charred shell of the B-double. They have contained spilled chemicals in a settling pond and nearby table drains.
Police said when forensic investigations of the scene are complete the fire brigade will clean debris from the road surface and the lane will be opened. It may take up to a day for the truck to be recovered from the area off the Bago Road exit.
8.15am: One northbound lane on the Pacific Highway has reopened at Herons Creek following a truck fire earlier this morning that blocked both northbound lanes.
Fire crews on-site have now extinguished the blaze, south of Port Macquarie.
Emergency services received the call around 3.30am. The B double was carrying mechanical fluids and what appears to be fabric and food.
Truck was heading north when it ran off the road, flattening guide posts on the right lane.
It appears the truck has also veered to the left hand side of the road knocking over the Bago exit sign, turning onto its side.
The truck was burnt out. It is understood the driver was deceased at the scene. Forensic police, fire brigade and HAZMAT crews at the scene.
Earlier northbound diversions via Laurieton have now also been lifted.
Southbound lanes of the Pacific Highway have not been affected.
Motorists travelling northbound on the Pacific Highway via this location are advised to exercise caution and allow additional travel times.