Three people have been killed in an early morning, single-vehicle crash on a regional NSW highway. -AAP Image
Three people have been killed in an early morning, single-vehicle crash on a regional NSW highway.
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Emergency services were called to the Kamilaroi Highway, south of Gunnedah in the state's north, about 6.30am on Wednesday after reports of a smash.
Three male back-seat passengers from the vehicle were declared dead at the scene, while a female front-seat passenger was flown to John Hunter Hospital in a serious condition.
The driver, a 24-year-old man, was uninjured but was taken to Tamworth Hospital for mandatory testing.
The dead passengers are yet to be formally identified.
Local police have established a crime scene and launched an investigation with the help of specialist officers into what caused the crash.
The Kamilaroi Highway remained closed in both directions between Curlewis and Gunnedah in the late morning.
Anyone who witnessed the crash or had relevant dashcam footage is asked to contact investigators.