From the BBC:
The Belfast office of Anglo Irish Bank is at the centre of an investigation after it accidentally released information on 500 UK customers.
A bank executive emailed a Northern Ireland client a spreadsheet containing details of derivatives transactions carried out on behalf of the customers.
The bank has informed financial regulators in Dublin and London and is contacting the 504 customers involved.
It said there is no security risk to any client’s accounts.
The mistake happened when a customer asked for a quotation on a derivative product on October 29th.
The banker sent the quotation but also attached confidential information on 803 transactions carried out for 454 corporate clients and 50 individuals.
Read more on the BBC.