The Raise and Give (RAG) week festivities in Waterford city ended up in disarray last night, after a large group of students took positions around the John Street area at 2:30am and refused to leave.
Hundreds of students descended on the place after the nightclubs closed, and things soon got out of hand.
A number of flares were reportedly discharged among the crowd.
Six people ended up being arrested for public order offences. All have been released without charge.
A Garda hat was also snatched during the fracas, though it is understood it has since been returned to the force.