AIB has lost confidential information belonging to a number of its customers in the west of Ireland.
The bank has confirmed that information relating to over 500 customers was mislaid on Thursday 31st August in Galway – a spokesman for AIB has confirmed to Midwest News that the majority of customers affected are in Co Galway.
A spreadsheet containing names, loan and deposit balances, as well as account turnover and annual fees, was lost by a staff member at the end of August.
However, the information did not contain customers addresses or contact details.
In a letter sent to affected customers this week, the bank says one of its employees was travelling between two branches in Galway when the data was "mislaid".
AIB says it has contacted all customers affected to "explain the matter and to apologise unreservedly".
The bank told customers that their funds cannot be accessed by anyone who may have come into possession of the lost documentation.
AIB also says it has reported the issue to the Office of the Data Protection Commissioner.