Aiken Promotions have just confirmed the news in a statement, explaining that the decision has been made with great regret and that the ticket return process will be 'outlined tomorrow'.
Read the statement in full:
The Garth Brooks Comeback Special Event
It is with great regret that Aiken Promotions today announce that the 5 concert Garth Brooks Comeback Special Event at Croke Park has been cancelled. No concerts will take place.
The ticket return process will be outlined tomorrow.
Aiken Promotions have exhausted all avenues regarding the staging of this event.
We are very disappointed for the 400,000 fans who purchased tickets for The Garth Brooks Comeback Special Event.