A woman was knocked unconscious during a fight in Mount Druitt on Sunday night.
Police were called to a home Hythe Street, Mount Druitt about 9.30pm on September 24, following reports of a domestic.
Two women, 35 and 34, allegedly fought inside the home.
One woman, 34, was knocked out.
She treated at the scene for a deep gash to her head, and taken to Nepean Hospital for further treatment by NSW Ambulance paramedics.
Officers said they were forced to hold a woman inside a police vehicle to prevent a disturbance of the peace.
Inquiries into the incident continue.
Anyone with information should contact Mount Druitt police, 9675 0699, or Crime Stoppers, 1800 333 000. You can also use the online reporting tool.