A Sydney nurse is fighting for life in hospital after being hit by an out-of-control car police allege was driven by a 14-year-old boy.
Danielle Oldfield was one of six seriously injured in the collision at Werrington about 7.30pm on Thursday, while her 16-year-old brother Billy was also hospitalised.
The pair was on their way to late-night shopping when their car was involved in a head-on collision.
The 27-year-old nurse was trapped inside the wreckage as 20 firefighters eventually managed to free her body, before she was taken to hospital where she remains in intensive care.
Danielle and Billy's father spoke with reporters on Friday morning revealing his traumatic experience when answering a call late on Thursday night.
"We got a phone call… a bad accident… son and daughter was involved," an emotional Rodney Oldfield recalled.
"They sedated her all night and she's in the theatre now."
Investigators say a 14-year-old boy from Bidwill was behind the wheel on a joyride with a car full of teenage friends.
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"It's very alarming when you're 14 and you’re behind the wheel," Deputy Inspector Katie Orr said.
The teenager police allege was driving the vehicle is also in intensive care at Westmead Children's Hospital.
Once responsive, crash detectives will begin their investigations with the boy.
Police have also urged anyone with dashcam footage from the scene to come forward.
Anyone with information is encouraged to call Crime Stoppers 1800 333 000 or use the Crime Stoppers online reporting page.