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It is understood that a global consortium of left-leaning media organizations is preparing to release the information in the coming days.

The leak comes a year after the release of the so-called “Panama Papers,” in which the hidden millions of some of the world’s rich and powerful were exposed. The disclosures led to the downfall of several governments.

Photo by Joe Raedle / Getty Images

Among those named in the “Panama Papers” were close associates of Vladimir Putin, the Russian president, and relatives of Xi Jinping, the Chinese leader, as well as Sigmundur David Gunnlaugsson, Iceland’s prime minister, and Lionel Messi, the Barcelona footballer.

When contacted about a hacking attack in Bermuda, Appleby, which has offices in the British Virgin Islands, the Cayman Islands, Guernsey, the Isle of Man, Jersey, Mauritius and the Seychelles, said “we are issuing a statement to all our clients today (Tuesday).”

Appleby denied any allegations of wrongdoing on its part.

The firm said: “Appleby operates in highly regulated jurisdictions and like all professional organisations in our regions, we are subject to frequent regulatory checks and we are committed to achieving the high standards set by our regulators. We are also committed to the highest standards of client service and confidentiality. It is what we stand for. This commitment is unequivocal.

We are committed to protecting our clients' data and we have reviewed our cyber security and data access arrangements. Appleby

“Appleby has thoroughly and vigorously investigated the allegations and we are satisfied that there is no evidence of any wrongdoing, either on the part of ourselves or our clients. We refute any allegations which may suggest otherwise and we would be happy to cooperate fully with any legitimate and authorised investigation of the allegations by the appropriate and relevant authorities.