The websites of more than a dozen U.S. airports were temporarily rendered unavailable to the public on Monday after a pro-Russian hacking group claimed credit for the attacks.

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People pass through the concourse at the airport.

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According to CNN, the hacking group Killnet, which has promoted Kremlin viewpoints and previously engaged in cyberattacks targeting western nations, claimed responsibility for the attack.

A senior official told ABC News that the attack made it difficult for the public to get information on airport wait times and congestion.

The airports targeted include Atlanta's Hartsfield-Jackson International Airport and New York's LaGuardia Airport, as well as Chicago O'Hare International Airport and Los Angeles International Airport, according to multiple outlets.

According to CNN, the U.S. Cybersecurity and Infrastructure Security Agency said there were no worries about airport operations.

The group claimed to hit airports in Idaho, Michigan, Hawaii, Massachusetts and other states.

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State government websites in Colorado, Kentucky and Mississippi were disrupted last week.

In the wake of Russia's invasion of Ukraine, Killnet claimed to target western nations that have imposed sanctions on the Kremlin. The group mainly carries out distributed denial of service attacks, which aim to flood a site or server with fake web traffic. The group has been involved in attacks across Europe. The hacktivists are known for attacking websites with pro-Russian messages.

Multiple US airport websites have been knocked offline. There was no impact on operations.

There have been cyber attacks at airports.

Europe is being invaded by Russia's hacking patriots.