Hackers have stolen data on over 600,000 Dominos Pizza customers in France and Belgium, according to Reuters.
An anonymous Twitter user threatened to publish the data unless the company pays a cash ransom.
Delivery addresses, customer names, email address, passwords and phone numbers were all taken from a server used in an online ordering system that the company is in the process of replacing, according to Dominos spokesman Chris Brandon, who spoke with Reuters on June 16.
He said he isn't sure if the stolen passwords had been encrypted.
A tweet sent at Domino's customers through an account of somebody listed as "Rex Mundi" said that hackers would release customer data on the Internet unless the company pays 30,000 euros ($40,800) according to a report by The Telegraph.
The account has since been suspended.
Domino's Vice President of Communications Tim McIntyre said the hacking was "isolated" to independent franchise markets of Belgium and France.
No financial data has been taken, according to Reuters.
"This does not affect any market outside of France and Belgium," he said via email. "The site has been secured."
Domino's has approximately 11,000 stores worldwide, including 229 in France, 24 in Belgium, and 5,000 in the U.S.
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