Cayman National Bank in the island has confirmed that financial information stolen by hackers includes clients’ names, addresses, account numbers and balances.

The bank said that the stolen data could potentially be used for fraudulent purposes - and urged clients to be vigilant.

It was revealed last week that a criminal hacking group has claimed responsibility for the data theft from Cayman National Bank (Isle of Man) Ltd and its sister company Cayman National Trust Company (Isle of Man) Ltd.

Some 2TB of confidential data is claimed to have been published.

In an update, the bank said it is continuing to investigate the extent of the theft of confidential data as a matter of urgency.

It has appointed specialist forensic IT consultants to assist with the investigation.

And it is liaising with the relevant regulators and authorities including the Financial Services Authority and the Manx police.

The bank said an unauthorised third party gained access to its systems and obtained confidential information relating to clients and the business which was then released online.

Personal, corporate, trust, and financial data was stolen, including the names, addresses, account numbers, and account balances of clients.

The bank said: ’We urge all clients and other individuals who may have been affected by the data breach to continue to be extra vigilant in order to protect themselves.

’The stolen data could potentially be used for fraudulent purposes. We encourage you to be on the lookout for any suspicious communications requesting information or payment from you.

’We will never contact you unprompted to ask for your account details or security information.’