The theft came to light after the central bank
received an anonymous email on Monday night demanding money in
exchange for the stolen addresses.
The hackers broke into a database storing details of people who
had registered for ECB conferences, visits and other events, the
bank said.
That database, which held about 20,000 email addresses and a
much smaller number postal addresses and phone numbers, was kept
physically separate from internal systems, it added.
"No internal systems or market sensitive data were compromised,"
the ECB said in a statement.
The ECB is currently running a particularly sensitive review of
the euro zone's top lenders, collecting streams of data to gauge
whether banks have valued loans and other assets correctly,
before it starts supervising them.
German police were investigating the breach and all people who
might have had their details stolen had been contacted, said the
bank.
(Reporting by Eva Taylor; Editing by Andrew Heavens)
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