A fight broke out in a Norwich street on Wednesday night, just a few minutes after England confirmed their place in the Euro 2020 final.
A spokesperson for Norfolk Police said officers were called at around 10.45pm to Ber Street.
A weapon was seen during the fight, which happened close to the Berstrete Gates pub and involved up to six people.
The East of England Ambulance Service sent two ambulances, a rapid response vehicle and the East Anglian Air Ambulance to the scene, after being told multiple people had been injured.
But when they arrived at the scene, no patients were found.
Police arrested a male teenager on suspicion of affray and he remains in custody.
Officers continue to investigate the incident.
A witness said they saw two police cars at the scene as well as the ambulances.
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