A woman was punched and slapped when someone tried to snatch her handbag in St Marys on Wednesday.
The woman, 26, was walking in Queen Street at about 7pm.
She felt a violent tug on her shoulder and fell to the ground when someone tried to steal her bag.
She said her attacker hit her before running away empty-handed towards St Marys railway station.
Police are investigating the incident and have released CCTV images of a woman they believe could assist them with their inquiries.
She is described as being of Aboriginal or Torres Strait Islander appearance, with a dark complexion, 20- to 25-years-old, of thin build, with dark-brown hair tied in a bun and wearing a dark-coloured singlet and black jeans or tights, with a white pattern down the side.
Anyone with any information is urged to contact St Marys detectives on 9677 7501 or Crime Stoppers on 1800 333 000.