Six people have been taken to hospital after a three-vehicle crash west of Richmond, NSW Police say.
Emergency services were called to Bells Line of Road, Bilpin, just after 1pm (Saturday 20 October 2018), after there was a collision between a Toyota Camry, Holden Cruz and Subaru Impreza.
The Toyota had been travelling east on Bells Line of Road, while the Cruz and Impreza were travelling west.
The 79-year-old man driving the Holden and his 72-year-old female passenger were treated at the scene before being conveyed to Westmead Hospital in a stable condition.
The 18-year-old woman driving the Toyota and the 17-year-old boy in the front seat were treated at the scene and before being taken to Westmead Hospital in a stable condition.
The rear seat passenger, a 15-year-old boy, was airlifted to Liverpool Hospital in a critical but stable condition with internal injuries.
The 23-year-old male driver of the Subaru was uninjured but was taken to Hawkesbury Hospital for mandatory blood and urine tests. His male passenger was also uninjured.
Officers from Hawkesbury Police District attended and established a crime scene. The road was closed for several hours while specialist police examined the crash scene.
Crash Investigation Unit officers are investigating the circumstances surrounding the incident.
Anyone with information or dashcam footage is urged to contact Crime Stoppers.