Payday loan company Wonga has suffered a data breach which could have affected nearly a quarter of a million UK customers.
The firm said it was "urgently investigating illegal and unauthorised access” to the personal data of some customers.
The company is the current short sponsor for Newcastle United, but the football club announced last year it will not be seeking to renew the deal at the end of this season.
It is believed that the data breach could affect up to 270,000 current and former customers - including 245,000 in the UK as well as a further 25,000 in Poland.
The stolen data includes names, addresses, bank account numbers, sort codes and phone numbers.
Following the alarm being raised, the firm started to contact customers on Saturday and has set up a dedicated phone line on 0207 138 8330 to offer support. Concerned borrowers should also reference the company’s FAQ page: https://www.wonga.com/help/incident-faq
Borrowers are advised to alert their bank and ask them to look out for any suspicious activity. Wonga will also be informing financial institutions about the breach.
While the lender say that they believe that customer’s Wonga accounts are safe, they suggest that anyone concerned may wish to change their wonga.com password.
Customers are also advised to watch out for unusual online activity and beware of cold calls and emails asking for personal information.
A company statement read: "We are working closely with authorities and we are in the process of informing affected customers. We sincerely apologise for the inconvenience caused."