Dixons Carphone shares fell 5.1% Wednesday in London after the consumer electronics retailer revealed a data breach involving 1.2 million personal records and 5.9 million payment cards. Hackers accessed one of the processing systems of Currys PC World and Dixons Travel stores in an “attempt to compromise” the cards, the British company said. It said approximately 105,000 payment cards without chip-and-pin protection, issued outside the European Union, are at risk, and it has notified the relevant card companies. A separate investigation unearthed the breach of personal data, which covers nonfinancial details such as name and email address. “We have no evidence to date of any fraudulent use of the data as result of these incidents,” Dixons Carphone said in a statement.