A teenage boy has been killed and four other people hospitalised after a stolen car crashed in a police chase, sparking a critical incident probe.

The car was picked up travelling at high speed on the New England Highway at Aberdeen in NSW's Hunter region just before midnight on Saturday.

Police began a pursuit after the driver failed to stop, before the car crashed about 100 metres north of Makybe Diva St at Scone.

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

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

The driver was flown to Newcastle's John Hunter Hospital, where he and three back-seat passengers - two boys aged 14 and 17 and a 25-year-old woman - were all being treated for non-life threatening i

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