Police were called to a convenience store on Pevensey Road, Eastbourne, around midday on Saturday (March 26) following an altercation involving a group of people known to each other.
One man suffered injuries to his head and leg and was taken to hospital for treatment. He has since been discharged. A second man also suffered minor injuries.
A 27-year-old man has been arrested on suspicion of wounding with intent and has been released on conditional bail while enquiries continue.
Officers are in contact with those involved in the altercation and are satisfied that there is no threat to the wider community.
An investigation is ongoing and anyone who saw what happened or who may have any relevant information or footage is asked to contact police online or by calling 101 quoting serial 499 of 26/03.
Alternatively, you can contact the independent charity Crimestoppers anonymously on 0800 555 111.