A 14-year-old boy is dead after the motorised bicycle he was riding crashed into two cars when he allegedly sped away from police who sounded their sirens at him.
The boy was taken to hospital in a critical condition but died just after midnight following the collision in Miller, in Sydney's south-west, on Tuesday night.
Police from the Green Valley Local Area Command said they saw the boy riding a motorised bicycle along Southdown Street about 9.15pm on Tuesday.
Police say there were no lights on the bike, and the boy was not wearing a helmet.
When the officers sounded their sirens to get his attention, he allegedly accelerated away from them and turned onto Banks Road, where he collided with two vehicles.
The boy suffered serious head injuries and was taken to Liverpool Hospital in a critical condition, however he died from his injuries.
The boy's father told Channel Nine that his son was not allowed to have a motorised bicycle, but he had swapped his bike for a motorised version on the day he died.
He said motorised bikes should be registered.
"They're unregistered, him riding unlicensed. Somehting needs to be done, it’s just wrong," the boy's father said.
"He shouldn't even have been on there at all. Parents like myself shouldn't be going through this. Parents shouldn’t have to bury their own children."
Assistant Commissioner Frank Mennilli said the officers had decided to turn off their sirens and not pursue the boy when the accident occurred.
"It was a very short interaction," he said.
"The police officers only turned on their warning devices to get his attention, to try and speak to (him)."
The accident had been traumatic for everyone involved, he said.
"Everyone is traumatised by this incident, it is a tragic situation," he said.
Critical incident teams from the Cabramatta and Burwood local area commands are now investigating the circumstances surrounding the crash.
The investigation will be overseen by the NSW Police Professional Standards Command.
Police have urged anyone with information about the incident to call Crime Stoppers on 1800 333 000 or use the Crime Stoppers online reporting page.