Gardaí are liaising with local schools in Swords, Co Dublin and Ashbourne, Co Meath after a fight broke out between two groups of young people last Friday.
The majority of the people involved appear to have travelled from Swords to Ashbourne by bus.
The group entered a multi-storey car park, where they approached a small group of people who immediately dispersed.
One person was assaulted and gardaí made three arrests.
Investigations are ongoing and gardaí are in the process of interviewing a number of other people involved in the incident.