Swiss bank Banque Cantonale de Geneve (BCGE) has said that a hacking group, which calls itself Rex Mundi, had stolen the personal details of about 30,000 clients.

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The hackers demanded BCGE a ransom of EUR10,000 ($12,000) for stolen information.

However, the bank refused to pay the group’s asking price for privacy and said that there had been no financial damage.

The hacked data included emails containing BCGE clients’ names, phone numbers and account numbers, as well as their emails with the bank.

BCGE said the client details had been released but added the information didn’t represent a financial risk for clients or the bank.

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The bank added that the authorities have launched an investigation into the hacking.

"As for fiscal risks, we asked all of our clients to regularize their (tax) situation. It is up to each of our clients to fulfill legal requirements in conformity with the legislation in force," a BCGE spokesperson said.

"At first analysis, this information is hardly critical, is obsolete or corresponds to foreseen contents about which it has already informed a significant number of clients concerned, " the bank said in a statement.

The BCGE has implemented an extensive exchange and communication structure and advised clients to take appropriate care and attention while using the internet.