Five people were involved in the fight, which injured one person who was taken to hospital by ambulance.
Three people fled the scene. The police search ended unsuccessfully.
The investigation is ongoing.
On Saturday afternoon at around 1:50PM police fined several members of the public after they had illegally visited relatives in Ettelbruck.
On Sunday morning at 4:30AM one person was fined in Niederkorn for hosting too many friends.
At 4:50AM on Sunday morning police received a noise complaint in Hollerich. Once again, too many people had gathered in the same place.
