The actions of police in a deadly chase with a stolen car will be probed as the force stresses the tragedy could have been avoided.

A teenage boy was killed and four other people taken to hospital after the stolen car crashed at Scone in NSW's Hunter region.

The car was picked up travelling at high speed on the New England Highway at nearby Aberdeen just before midnight on Saturday, with police initiating a pursuit.

It was reduced to a wreck off the side of the road, about 100 metres north of Makybe Diva St.

The car's driver, a 14-year-old boy, and front-seat passenger were trapped before being freed and treated by paramedics.

The passenger, a 17-year-old boy, died at the scene.

The driver was flown to Newcastle's John Hunter Hospital, where he and three back-seat passengers - two bo

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