An Australian woman on a study trip to Rome was punched in the face and then subjected to a vicious rape in a park near the Colosseum.

The 49-year-old was on a study tour of the Italian capital when the attack occurred in the Colle Oppio park on Sunday night.

She had been drinking in a bar near the Termini train station before the assault took place. She has been unable to give police a description of the attacker because she has no memory of the incident after having her purse and mobile phone stolen and being punched in the face, Italian media reported.

A member of the public found her and took her to a nearby hospital where she is being treated for concussion and injuries to her face.

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She was supposed to leave Rome for Paris on Tuesday but will now have to stay in the city.

Police are looking for a 30-year-old Romanian man who was seen leaving the bar together with the victim in CCTV footage, however they suspect a second man may have been involved in the rape, Il Corriere reported.

On Monday, Rome police arrested three people for the rape and beating of another woman, a 48-year-old Brazilian, on September 25.