(Bloomberg) -- UniCredit SpA said hackers accessed about 400,000 client bank accounts in Italy, taking biographical and loan data in one of the biggest breaches in Europe to date.

The incidents occurred in September and October of 2016 and June to July of this year, the bank said on Wednesday in an emailed statement. Unauthorized access was gained through an Italian third-party provider to some customer data related to personal loans, with the lender saying IBAN numbers and other personal data may also have been reached. A spokesman declined to identify the third party involved.

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