Specialist paramedics from a rescue chopper accompanied the teen to hospital but the helicopter, which landed in nearby parkland, was ultimately not required. 

The teen was carried from the bush on a stretcher, with about 12 police, firefighters, paramedics and onlookers assisting.

The Mercury understands the teen is in a stable condition. 

Earlier: A Dapto teenager has been seriously injured in a mountain bike accident at Balgownie on Monday afternoon.

New South Wales ambulance paramedics were called to a bushland location off Doonan Place about 2.40pm with reports a teenager had come off his mountain bike and landed on his head.

The 15-year-old boy suffered serious injuries to the right side of his face – one eye is completely closed and he has suspected skull fractures.

The boy’s father, Wayne Aleckson, said his son was riding with three of his mates when he crashed. 

“He lost consciousness for a while but he’s with us now,” Mr Aleckson said.

“He doesn’t remember what happened and didn’t remember where he was, but he does now.

“He’s pretty sore, pretty black and pretty bloody at the moment.”

Mr Aleckson said these were only the latest injuries for his son, competitive rider Jayden Aleckson, who broke three vertebrae in another riding accident earlier this year. 

“It's part of the territory they play in,” Mr Aleckson said. 

A rescue chopper is en route to the site. 

Paramedics will put the boy on a stokes litter stretcher and carry him to the helicopter landing zone.

More to come.