Five youths were arrested and another was hospitalised following a number of public order offences in the Mayfield area on Saturday night, after a house party spiralled out of control.
It is understood a birthday party was organised on social media and 150 people turned up thanks to the open invitation.
Garda sources confirmed that six Garda vehicles attended the scene at Springvale, Old Youghal Road, Mayfield, Cork, on Saturday night at approximately 9.30pm and were there until the early hours of the morning.
Two youths were assaulted and one was taken to Cork University Hospital with minor injuries.
Superintendent Mick Comyns issued a warning to anyone organising a party to be very careful with the use of social media as an event can become too big to manage.
“If you are organising a party, please be careful about the use of social media,” Supt Comyns said.
City councillor Ted Tynan said he was shocked to hear of the alleged mass brawl between around 100 people in the area, and reports of a possible stabbing incident.
“There was a huge crowd involved in the incident which was shocking,” he said.
“There was a girl who lost a tooth and there was reports of one person being stabbed with a broken bottle, but people and social media can run wild at times like these.
“I’ve spoken to around eight or nine people in the area and from what I’ve heard, it was a very serious incident,” he added.
“If not for the intervention of the gardaí, the incident could’ve escalated and been much, much worse with potential for very serious injuries."