ReutersHackers have reportedly stolen the personal details of more than half a billion Ticketmaster users.
The ShinyHunters hacking group is allegedly demanding a $500,000 (£400,000) ransom payment to prevent the information being sold to other parties.
The American website Ticketmaster, one of the largest online ticket sales platforms in the world, has yet to confirm whether it has experienced a security breach.
Australia’s Department of Home Affairs is engaging with Ticketmaster to “understand the incident”.
Reports suggest a group of hackers gained access to the names, addresses, phone numbers and the partial payment details of 560 million Ticketmaster customers worldwide.
The FBI has offered assistance to Australian authorities, a US embassy spokesperson told AFP.
ShinyHunters has been linked to a string of high-profile data breaches resulting in millions of dollars in losses to the companies involved.
In September last year, almost 200,000 Pizza Hut Customers in Australia had their data breached.
The FBI unsuccessfully tried to close the domain that the hackers use.
EPAThis is not the first time Ticketmaster has been hit with security issues.
In 2020 it admitted it hacked into one of its competitors and agreed to pay a $10m fine.
In November it was allegedly hit by a cyber attack which led to problems selling tickets for Taylor Swift’s Era’s tour.
Earlier this month, US regulators sued Live Nation, Ticketmaster’s parent company, accusing the entertainment giant of using illegal tactics to maintain a monopoly over the live music industry.
The lawsuit from the Department of Justice said the firm’s practices had kept out competitors, and led to higher ticket prices and worse service for customers.
The BBC has contacted Live Nation for comment.
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