A woman and four boys have been charged over the sexual assault of a woman who was allegedly attacked by a friend's son and a group of his mates in an abandoned house in Sydney's west, police say.
Police were called to the house on Winten Drive, Glendenning, at 6.30pm on May 12 and found a 41-year-old woman suffering minor injuries.
She told officers she'd met a friend at a local club earlier in the day and was driven to the abandoned house.
Police said she was then repeatedly sexually assaulted by the friend's son and other boys.
A 14-year-old boy was arrested a week ago and was charged with aggravated sexual assault.
He appeared in court and will return to Mt Druitt Local Court on September 18, when he is expected to face further charges.
Yesterday police arrested a 35-year-old woman, two 18-year-old men and a 16-year-old boy.
The woman was charged with hinder discovery of evidence and the three males were charged with sexual assault in company and deprivation of liberty.
All four are due to face court in Mt Druitt later today.