A 16-year-old boy has been taken to hospital after being found chained to a bed in his family's Blacktown home.
The teenager, who is believed to have autism, was found by a charity worker who had attended the home, police said.
He had allegedly been left in the house by himself and was chained to a bed in a back room of the small brick home.
Police and paramedics arrived at the Mort Street just after midday on Tuesday and freed the teenager before removing him from the home on a stretcher.