Ticketmaster says it first identified the breach on May 20. Three days later, it identified that personal information may have been affected by the breach, which was the subject of Monday's email.

Ticketmaster users across the U.S. are reporting instances of their tickets being transferred from their account and resold elsewhere without their permission.

Ticketmaster has finally notified its users of a data breach — one month after Global News first reported that the personal information of Canadian customers was likely stolen.