A 21-year-old man, arrested on suspicion of rape on Monday, has been released on police bail.
The incident happened between 1am and 1.30am on Sunday, in the car park of the Wok and Rock restaurant on Mill Road.
The man, from the Lakenheath area, has been released on bailed until October 1, pending further enquiries.
Police have also renewed an appeal for further witnesses to come forward.
Detective Inspector Andy Footer said: “We would like to hear from all persons who were at the Wok and Rock restaurant between 11pm on Saturday through to 2am on Sunday.”
Anyone with information is asked to call Bury St Edmunds CID on 101, quoting reference MH/14/1248.
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