Four people have now been charged with attempted murder after a young woman was allegedly kidnapped, bundled into the boot of a car, driven to a historic Sydney bridge and thrown into the Hawkesbury River on the weekend.
The 19-year-old victim has told police she was driven to the seven-metre-high Windsor Bridge in the early hours of Sunday before a group of people threw her into the river below.
After surviving the fall she swam to the riverbank and alerted police. She was taken to Nepean Hospital for treatment.
NSW Police allege the victim was kidnapped on Saturday night in Campbelltown before being driven to Windsor some 60 kilometres away.
Detectives arrested a 22-year-old man in Windsor on Wednesday night on charges including attempted murder, aggravated robbery and wounding a person with intent to cause grievous bodily harm.
A 19-year-old woman and a 17-year-old girl had previously been charged on Tuesday and Wednesday afternoon, respectively, with attempted murder, aggravated kidnapping and robbery with wounding.
Then on Thursday morning, a 16-year-old boy was arrested at a home in Wallacia. He was taken to Windsor Police Station where he was also charged with attempted murder.
He was refused bail and is due to appear in a children's court on Friday.
Investigators don't expect to make any more arrests. They say all five people were known to each other.