TWO people are in a critical condition and several others seriously injured after a stolen truck crashed into several cars and a building and burst into flames in the centre of Singleton in the NSW Hunter region.
A fireball erupted during the five-vehicle collision on the New England Highway this morning and rescue crews are attempting to free a person trapped in a car.
The person has critical head and chest injuries and four other sustained minor injuries.
Photos on social media show a huge plume of black smoke and burning cars in the street.
The truck was reportedly stolen from the BP service station at Murrurundi earlier in the day, while the owner was paying for fuel, the Singleton Argus reported.
Police spotted the truck being driven erratically south along the New England Highway, through Muswellbrook and towards Singleton.
Witness Meri Basci said: “He was so fast, he missed me and a few other cars in a millisecond. I am still in shock.”
A pursuit was not initiated, police said. As it approached the town, officers deployed road spikes in an attempt to stop the vehicle.
It continued into George Street where it caught fire after crashing into several vehicles and buildings, injuring a number of people.
The driver was arrested at the scene and is currently being interviewed by police.
Police said a Critical Incident team from Port Stephens Local Area Command has been called in to lead an inquiry.
Meanwhile, emergency services are at the scene of a fiery B-double truck crash that has closed the Hume Highway in the NSW Southern Highlands and sparked a grass fire.
The accident happened around 8.30am on Wednesday on the Wingecarribee Bridge near Berrima, and drivers are being diverted, according to the Transport Management Centre.
Nine RFS crews are working to extinguish the fire that started after burning debris from the truck fell to the ground below, while the truck driver has escaped serious injury, RFS Inspector Ben Shepherd told AAP.