Airports in Los Angeles and Atlanta were among those affected. Officials say there was no effect on operations

Websites for a handful of U.S. airports, including those in Atlanta, Chicago, New York and Los Angeles, were taken offline during a cyberattack Monday, although officials said there was no effect on flight operations.

Managers at multiple airports said they notified the FBI and the Transportation Security Administration about the cyberattacks. In a statement, the FBI said it was aware of the incident but had no additional information. The TSA declined to comment, referring inquiries to individual airports.

The attacks were carried out by a group of pro-Russian hackers known as Killnet, according to John Hultquist, vice president for intelligence at Mandiant, an American cybersecurity firm. Killnet called for coordinated denial-of-service attacks on cyber targets from a list it posted on its Telegram channel — a list that included several major U.S. airports. Denial-of-service attacks occur when a target is flooded with traffic until it can’t respond or crashes.

Hackers knock some U.S. airport websites offline

Airports in Los Angeles and Atlanta were among those affected. Officials say there was no effect on operations

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