Hackers are believed to have targeted Qatar's largest bank, exposing the personal details of hundreds of customers including the ruling family, intelligence officials and Al Jazeera journalists.
Qatar National Bank said it was investigating 'an alleged data breach' after a file that appears to contain account information began circulating online.
The 1.4GB data dump was organised into nine folders, with names including Al Jazeera, Police, Security, Defence and etc and Mukhabarat – the Arabic name for intelligence services.
It also included a folder named Al Thani, the name of Qatar's ruling family, which purported to include details on many of its members.
Several were marked SPY.
Four people identified in the files have confirmed their personal information was authentic.
The files are not uniform, but in many cases contain bank logins, passwords, security questions and answers, Qatari national identification numbers, phone numbers and emails.
'Everything that they had was correct,' said Gordon Hickey, who used to work for Al Jazeera and now works as a freelancer in Ireland.
'It's a complete personal breach. It's awful.'
Al-Jazeera said its online security division has sent a message to all staff assuring them that its own internal networks have not been compromised.
© Associated Newspapers Ltd.