Police in Brighton arrested a 32-year-old man on Sunday morning after three men were mown down by a car on the seafront.
Officers were called to Marine Parade shortly after 5.20am on Sunday after a report of a large group of people fighting with weapons.
A number of the group are believed to have jumped into a car as police arrived at the scene, with the vehicle then ploughing into three men involved in the altercation.
A man was arrested on suspicion of causing grievous bodily harm and the three men were taken to the Royal Sussex County Hospital, two with serious head injuries.
The 32-year-old remains in custody. The vehicle was later found abandoned.
The Marine Parade has been closed from the pier roundabout and forensic officers are still on the scene.
Sussex Police have said the incident was not terror-related and are appealing for anyone with information to contact detectives.
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Detective Inspector Chris Thompson said: “This is a fast-moving investigation and we are appealing for anyone who may have seen the incident or has any information about it to come forward.
“Marine Parade is currently closed between the pier roundabout and Camelford Street while we carry out enquiries and I would like to thank the public for their patience.”
Anyone with information is asked to ring 101 and quote Operation Danebrige or contact Sussex Police through their website.