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.