'Panama papers' came from email server hack at Mossack Fonseca Money-shuttling firm lost 2.6 TB of data and didn't even notice

https://www.wordfence.com/blog/2016/04/mossack-fonseca-breach-vulnerable-slider-revolution/
https://www.theregister.co.uk/2016/04/05/email_server_hack_led_to_mossack_fonseca_leak/
The leak of documents from Panama-based, internationally-franchised firm Mossack Fonseca appears to confirm what has long been suspected but rarely proven: well-heeled politicians, businesses, investors, and criminals use haven-registered businesses to hide their wealth from the public and from taxmen.

Bloomberg says co-founder Ramon Fonseca told Panama's Channel 2 the leaked documents are authentic and were “obtained illegally by hackers”.

According to The Spanish, the whistleblower accessed the vast trove of documents by breaching Mossack Fonseca's email server, with the company sending a message to clients saying it's investigating how the breach happened, and explaining that it's taking “all necessary steps to prevent it happening again”.