A man sustained injuries during a street altercation in the centre of Bradford, prompting one arrest.
Emergency services responded to reports of a disturbance on Sackville Street in the early hours of Sunday morning.
Officers arrived at the scene at 7.02am and discovered an individual with injuries that were not considered life-threatening.
A man aged 24 was taken into custody on suspicion of affray.
He has subsequently been released on bail while investigations continue.
A representative for West Yorkshire Police confirmed that enquiries are being conducted by detectives from Bradford CID.
The force has appealed for anyone who may have observed the incident to come forward with information.