An FBI spokesperson told the BBC: “We cannot comment on this matter.”
“The Australian Government is aware of a cyber incident affecting Ticketmaster,” a spokesperson for the Australian Department of Home Affairs said in a statement to BBC media partner CBS News.
“The National Cyber Security Agency is working with Ticketmaster to understand the incident.”
US website Ticketmaster, one of the world's largest online ticket sales platforms, has not yet confirmed whether a security breach occurred.
Cybersecurity experts warn the claims may be false, but Australian authorities, where the claims were first reported, have confirmed they are investigating.
An advertisement containing some samples of data believed to have been obtained from the breach was posted on the website of BreachForums, a newly launched hacking forum.
ShinyHunters has been linked to a series of high-profile data breaches that have resulted in millions of dollars in losses for the companies involved.
In 2021, the group sold a physical database of information stolen from 70 million customers of US telecommunications company AT&T.
Last September, the data of about 200,000 Pizza Hut customers in Australia was leaked.
