Three Oxford men have been arrested on suspicion of rape.
Police said a 19-year-old woman reported that she had been raped in a flat in Abingdon Road.
A Thames Valley Police spokesman said the incident was reported at 9.50pm on Friday night but he could not confirm what time the alleged incident occurred.
The victim is believed to be from the Littlemore area.
A 19-year-old, 23-year-old and 28-year-old man are being held in custody for questioning.
Police said they are all from Oxford.
Police are not appealing for witnesses.
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