Italy's largest bank, Unicredit, says accounts of some 400,000 customers in Italy have been hacked.
The bank said in a statement Wednesday that the hackers accessed only data related to personal loans, and that it was breached through an unidentified external commercial partner.
Initial breaches occurred September and October last year and had not previously been disclosed. They were followed by a more recent one in June and July. The bank said no passwords appear to have been jeopardized, but that personal data, including names and birthdates, along with IBAN numbers "might have been accessed."
The bank said it was filing a criminal complaint with prosecutors and is taking action to close the breach.