What's more some 5.8 million credit card details may have been exposed in the process, alongside 1.2 million instances of non-financial personal data.
Dixons Carphone said it had immediately notified the relevant card companies so that they could protect customers.
Because the data breach dates back to past year it will be dealt with by the ICO under the powers of the Data Protection Act 1998 and not the European Union General Data Protection Regulation (GDPR) which went into effect on May 25.
In a statement released this morning, the company said during a review of systems and data, it discovered that there has been "unauthorised access to certain data held by the company".
Dixons Carphone chief exec Alex Baldock apologised to customers for the inconvenience, adding (as is standard in post-breach statements) that the company takes security seriously.
However, it was quick to add that 5.8 million of these cards had chip and PIN protection, and that the data stolen did not include pin codes, card verification values (CVV) or authentication data - making it more hard for the hackers to monetize the breached data.
The company said the probe was continuing, but it had found that there was an attempt to compromise 5.9m cards in one of the processing systems of Currys PC World and Dixons Travel stores.
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It said there was now no evidence of any fraudulent use of the information - with the vast majority of the cards having chip and pin protection.
Separately, the investigation has found that 1.2m records containing non-financial personal data - such as name, address and email - had been accessed.
"We are extremely disappointed and sorry for any upset this may cause", he said. About 105,000 cards issued outside the European Union, without chip-and-PIN protection, were compromised, Dixons said.
Baldock said the company had engaged cyber security experts to handle the matter and would be communicating directly with those customers affected.
In Virginia , women won Democratic primaries in four out of four congressional districts that could be competitive this November. One of the most interesting GOP primaries in Nevada involves legal brothel owner Dennis Hof challenging GOP state Rep.
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During his seven-year tenure, Casey went 320-238 (.573). "I leave here with my head high", he told TSN via text message in May. Toronto fired Dwane Casey on May 11 after the team was swept by the Cleveland Cavaliers in the Eastern Conference semifinal.
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