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Several large airports as well as over a dozen major U.S. air travel websites were attacked on Monday. The pro-Russian hacker group known as "Killnet" is believed to be behind the incident that downed multiple sites but failed to meddle in air travel.

At least 13 public-facing travel sites were hit by denial-of-service attacks on Monday.

Federal officials expressed concern for the hacking episode, but said it was not as bad as they had thought. Kiersten Todt, Chief of Staff of the US Cybersecurity and Infrastructure Security Agency, said there was no concern about operations being disrupted.

The airports that have been affected are Des Moines International Airport, Los Angeles International Airport, Chicago O'Hare International Airport, and the Atlanta International Airport. It would appear that all of the airports have recovered from the attacks.

The Killnet group is believed to be behind the attacks, according to John Hultquist, head of intelligence analysis at Mandiant. According to reports, Killnet has been conducting cyberattacks on NATO allied countries in Europe. The group claims to be a "hacktivist" group, which can often be used for state-authorized operations. Killnet's activities have been focused on the U.S. Killnet is said to have targeted a number of websites. Colorado.gov and Kentucky.gov were taken down by the attackers.