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Following a successful hack, the European Central Bank (ECB) shut down one of its websites.

The ECB said that it has taken down its Banks’ Integrated Reporting Dictionary (BIRD) website after it discovered that the site’s security was compromised. The hack was discovered during “regular maintenance work,” the bank says.

“The breach succeeded in injecting malware onto the external server to aid phishing activities,” said the ECB.

The contact information of the site’s users (including names, emails, and titles) may have been taken but their passwords were not, the central bank said. Its internal systems were not affected by the breach.

“The BIRD website provides the banking industry with details on how to produce statistical and supervisory reports. It is physically separate from any other external and internal ECB systems,” it said.

The bank noted that it’s contacting people whose data may have been affected, and that the website has been closed until further notice.