Disabled Woman Allegedly Thrown Off Bridge

A fourth person has been charged with attempted murder after a 19-year-old woman, who is disabled, survived being thrown off a bridge in Sydney's north-west.

A 16-year-old boy was arrested at his home in Wallacia and taken to Windsor Police Station, where he was charged with attempted murder, kidnapping, robbery and wounding a person with intent to cause grievous bodily harm.

Three other people are already before the courts, including Brooke Brown, 19, who had her bail refused on Wednesday.

Matthew Leuthwaite, 22, is due to front Penrith Local Court on Thursday charged with attempted murder, aggravated robbery and wounding a person with intent to cause grievous bodily harm.

A 17-year-old girl will face children's court today also charged over the incident.

Three suspects were arrested when they separately attended Windsor Police Station. Photo: Ten Eyewitness News.

The 19-year-old victim told police she was taken by a group of teenagers on Saturday night, held against her will and attacked, before being thrown from the Windsor Bridge into the Hawkesbury River below, in the early hours of Sunday morning.

The woman, who has a birth defect and is missing part of her left arm, as well as having a learning disability, managing to swim to the riverbank and get help.

She was taken to Nepean Hospital for treatment.

Police have also seized a car allegedly used to transport the victim from a home in Whalan to the Windsor bridge.

The 16-year-old boy, who was refused bail, will be appearing in a children's court on Friday.

Photo: Supplied