Bicester police are appealing for information after a fight in the town centre involving up to 30 people.
The incident happened at about 4am on March 28, in Market Square.
Police officers brought the disturbance under control and three men were arrested on suspicion of assault.
They have been bailed pending further inquiries.
There were no serious injuries, and no-one was taken to hospital.
Pc Nikki Forster said: "Public order incidents of this nature will not be tolerated by police, and will be thoroughly investigated as part of our commitment to tackling antisocial behaviour.
"We are appealing for anyone with any information regarding the fight to contact us as this may help our investigation."
Anyone with information should call Pc Forster via the Police Enquiry Centre on 08458 505 505. Alternatively call Crimestoppers, anonymously, on 0800 555 111.
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