Six people were injured in a brawl that broke out in the early hours of Monday in Gerakas, eastern Attica, between a group of Greeks and a group of Albanians.
Police are investigating whether the altercation could have been triggered by a shootout between police and an ethnic Greek in southern Albania on Sunday night that resulted in the llatter's death.
The fight broke out shortly before 2 a.m, in a park, according to police who said that three people were transferred to the Sismanogleio hospital after the fight, including a Greek man with a gunshot wound.
Another three people were taken to the local Red Cross hospital.
A firearm found at the scene of the brawl was being examined by the police.