Millions of Dixons Carphone customers’ personal details have been hacked in a major data breach.
The electronics retail group said the breach involved customers from Currys PC World and Dixons Travel, which it owns.
It hit 5.9 million customers’ cards – most of which were protected by chip and pin.
Furthermore, 1.2 million personal data records were compromised, meaning hackers were able to access information such as customers’ names, addresses or email addresses.
The group is contacting all those affected, but sought to assure it had no evidence that this had resulted in fraud at this stage.
Dixons Carphone chief executive Alex Baldock said: "We are extremely disappointed and sorry for any upset this may cause.
"The protection of our data has to be at the heart of our business, and we've fallen short here.
"We've taken action to close off this unauthorised access and though we have currently no evidence of fraud as a result of these incidents, we are taking this extremely seriously.
"We are determined to put this right and are taking steps to do so; we promptly launched an investigation, engaged leading cyber security experts, added extra security measures to our systems and will be communicating directly with those affected."