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On the same day that the LockBit ransomware gang’s leader was publicly named by U.S. law enforcement agencies, the group took credit for a devastating attack on the city of Wichita.

The Kansas city first announced the incident on Sunday, and since then it has caused a cascade of problems — from shutting off the WiFi and departure screens at the local airport to forcing all city-run organizations to revert to cash payments.

LockBit added the city to its leak site on Tuesday, giving officials until May 15 to pay an undisclosed ransom. The group has continued to post new victims following a law enforcement operation in February where agencies in the U.K. and U.S. took down infrastructure used for ransomware attacks.

LockbitSupp, the pseudonymous leader of LockBit, was identified Tuesday as a Russian national called Dmitry Khoroshev as the United States, United Kingdom and Australia imposed financial sanctions against him.