Last week, Killnet targeted the websites of several U.S. states, successfully knocking Colorado.gov offline for more than a day and briefly interrupting Kentucky.gov. Killnet frequently posts lists of targeted websites on its Telegram channel, encouraging fellow Russia supporters with entry-level hacker skills to join it in trying to disrupt them. The U.S. Department of Transportation and Hartsfield-Jackson Atlanta International Airport didn’t immediately respond to requests for comment. It listed the city of Chicago’s general air travel website, flychicago.com, which was inaccessible Monday, but not that of its major airports, like O’Hare International or Midway International. Similarly, it targeted Hawaii’s state website for air travel, which was also inaccessible, but not Honolulu International.

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