Gardaí are investigating reports of online fraud involving the resale of tickets for the Electric Picnic festival.
The sold-out event will take place in Stradbally, Co Laois later this month.
Electric Picnic returns on 29 August, with tickets all sold out, except for resale tickets.
The investigation began after a number of people came forward on social media in recent weeks claiming they were scammed.
Gardaí said they are appealing to anyone who believes that they may have been a victim of online fraud to please report it at your local garda station in person or by phone, or alternatively call the Freephone Garda Confidential Line on 1800 666 111.
In a statement, An Garda Síochána said: "It is important that people exert a great degree of caution if attempting to purchase tickets for a sold-out event through any third-party known or otherwise.
"Do not trust that the tickets you believe you are purchasing are real. It is likely that they will not materialise and in fact, do not exist."
"Please do not send money through any app in advance," it added.
