Police are hunting a group who chased and sexually assaulted a 21-year-old woman in Bentley on Tuesday.

The woman was walking along Wyong Road at about 10.30am when she realised three people who were following her in a white car yelled abuse at her and called her by another name.

When the woman tried to run away, a female left the car and chased her before returning to the car.

The group used the car to follow the woman to Merv McIntosh Reserve and a female and two males got out of the car.

The woman was pushed to the ground where the men pinned her down while the female punched and kicked her.

One of the men sexually assaulted her after the female returned to the car.

The group fled the scene in the car which is described as a white-coloured, older style sedan with blue and white number plates and a black roof rack.

The female is described as being a light-skinned Aboriginal woman in her mid 20s, about 165cm tall with a medium build and dark hair tied in a bun. She was wearing denim shorts, a white singlet and thongs.

One of the males is described as being a dark-skinned Aboriginal in his late 20s, about 175cm tall with an athletic build and short, dark hair and unshaven. He was wearing a dark-coloured t-shirt with a big red logo on the front and dark-coloured jeans. The man was barefoot during the attack.

The second male is also described as a dark-skinned Aboriginal in his late 20s, about 170cm tall with a slim build, clean shaven and an earring in his right ear. He was wearing a blue or grey coloured singlet and light-coloured jeans. He was also barefoot during the attack.

Those with information are asked to contact Crime Stoppers on 1800 333 000.

The West Australian

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